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ce48b32979
Currently file passed to --config file is parsed using TsConfig structure that does multiple things when loading the file. Instead of relying on that structure I've introduced ConfigFile structure that can be updated to sniff out more fields from the config file in the future.
752 lines
21 KiB
Rust
752 lines
21 KiB
Rust
// Copyright 2018-2021 the Deno authors. All rights reserved. MIT license.
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use crate::config_file;
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use crate::media_type::MediaType;
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use deno_core::error::AnyError;
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use deno_core::resolve_url_or_path;
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use deno_core::serde_json;
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use deno_core::ModuleSpecifier;
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use std::error::Error;
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use std::fmt;
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use std::ops::Range;
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use std::rc::Rc;
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use std::sync::Arc;
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use std::sync::Mutex;
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use swc_common::chain;
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use swc_common::comments::Comment;
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use swc_common::comments::CommentKind;
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use swc_common::comments::SingleThreadedComments;
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use swc_common::errors::Diagnostic;
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use swc_common::errors::DiagnosticBuilder;
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use swc_common::errors::Emitter;
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use swc_common::errors::Handler;
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use swc_common::errors::HandlerFlags;
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use swc_common::FileName;
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use swc_common::Globals;
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use swc_common::Loc;
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use swc_common::SourceFile;
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use swc_common::SourceMap;
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use swc_common::Span;
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use swc_ecmascript::ast::Module;
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use swc_ecmascript::ast::Program;
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use swc_ecmascript::codegen::text_writer::JsWriter;
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use swc_ecmascript::codegen::Node;
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use swc_ecmascript::dep_graph::analyze_dependencies;
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use swc_ecmascript::dep_graph::DependencyDescriptor;
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use swc_ecmascript::parser::lexer::Lexer;
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use swc_ecmascript::parser::token::Token;
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use swc_ecmascript::parser::EsConfig;
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use swc_ecmascript::parser::JscTarget;
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use swc_ecmascript::parser::StringInput;
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use swc_ecmascript::parser::Syntax;
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use swc_ecmascript::parser::TsConfig;
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use swc_ecmascript::transforms::fixer;
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use swc_ecmascript::transforms::helpers;
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use swc_ecmascript::transforms::hygiene;
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use swc_ecmascript::transforms::pass::Optional;
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use swc_ecmascript::transforms::proposals;
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use swc_ecmascript::transforms::react;
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use swc_ecmascript::transforms::typescript;
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use swc_ecmascript::visit::FoldWith;
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static TARGET: JscTarget = JscTarget::Es2020;
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#[derive(Debug, Clone, Eq, PartialEq)]
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pub struct Location {
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pub filename: String,
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pub line: usize,
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pub col: usize,
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}
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impl From<swc_common::Loc> for Location {
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fn from(swc_loc: swc_common::Loc) -> Self {
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use swc_common::FileName::*;
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let filename = match &swc_loc.file.name {
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Real(path_buf) => path_buf.to_string_lossy().to_string(),
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Custom(str_) => str_.to_string(),
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_ => panic!("invalid filename"),
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};
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Location {
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filename,
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line: swc_loc.line,
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col: swc_loc.col_display,
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}
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}
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}
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impl From<Location> for ModuleSpecifier {
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fn from(loc: Location) -> Self {
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resolve_url_or_path(&loc.filename).unwrap()
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}
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}
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impl std::fmt::Display for Location {
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fn fmt(&self, f: &mut std::fmt::Formatter) -> std::fmt::Result {
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write!(f, "{}:{}:{}", self.filename, self.line, self.col)
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}
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}
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/// A buffer for collecting diagnostic messages from the AST parser.
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#[derive(Debug)]
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pub struct DiagnosticBuffer(Vec<String>);
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impl Error for DiagnosticBuffer {}
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impl fmt::Display for DiagnosticBuffer {
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fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
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let s = self.0.join(",");
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f.pad(&s)
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}
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}
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impl DiagnosticBuffer {
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pub fn from_error_buffer<F>(error_buffer: ErrorBuffer, get_loc: F) -> Self
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where
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F: Fn(Span) -> Loc,
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{
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let s = error_buffer.0.lock().unwrap().clone();
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let diagnostics = s
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.iter()
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.map(|d| {
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let mut msg = d.message();
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if let Some(span) = d.span.primary_span() {
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let loc = get_loc(span);
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let file_name = match &loc.file.name {
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FileName::Custom(n) => n,
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_ => unreachable!(),
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};
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msg = format!(
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"{} at {}:{}:{}",
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msg, file_name, loc.line, loc.col_display
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);
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}
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msg
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})
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.collect::<Vec<String>>();
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Self(diagnostics)
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}
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}
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/// A buffer for collecting errors from the AST parser.
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#[derive(Debug, Clone, Default)]
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pub struct ErrorBuffer(Arc<Mutex<Vec<Diagnostic>>>);
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impl Emitter for ErrorBuffer {
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fn emit(&mut self, db: &DiagnosticBuilder) {
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self.0.lock().unwrap().push((**db).clone());
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}
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}
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fn get_es_config(jsx: bool) -> EsConfig {
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EsConfig {
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class_private_methods: true,
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class_private_props: true,
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class_props: true,
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dynamic_import: true,
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export_default_from: true,
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export_namespace_from: true,
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import_meta: true,
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jsx,
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nullish_coalescing: true,
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num_sep: true,
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optional_chaining: true,
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top_level_await: true,
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..EsConfig::default()
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}
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}
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fn get_ts_config(tsx: bool, dts: bool) -> TsConfig {
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TsConfig {
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decorators: true,
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dts,
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dynamic_import: true,
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tsx,
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..TsConfig::default()
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}
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}
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pub fn get_syntax(media_type: &MediaType) -> Syntax {
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match media_type {
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MediaType::JavaScript => Syntax::Es(get_es_config(false)),
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MediaType::Jsx => Syntax::Es(get_es_config(true)),
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MediaType::TypeScript => Syntax::Typescript(get_ts_config(false, false)),
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MediaType::Dts => Syntax::Typescript(get_ts_config(false, true)),
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MediaType::Tsx => Syntax::Typescript(get_ts_config(true, false)),
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_ => Syntax::Es(get_es_config(false)),
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}
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}
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#[derive(Debug, Clone)]
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pub enum ImportsNotUsedAsValues {
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Remove,
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Preserve,
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Error,
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}
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/// Options which can be adjusted when transpiling a module.
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#[derive(Debug, Clone)]
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pub struct EmitOptions {
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/// Indicate if JavaScript is being checked/transformed as well, or if it is
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/// only TypeScript.
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pub check_js: bool,
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/// When emitting a legacy decorator, also emit experimental decorator meta
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/// data. Defaults to `false`.
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pub emit_metadata: bool,
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/// What to do with import statements that only import types i.e. whether to
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/// remove them (`Remove`), keep them as side-effect imports (`Preserve`)
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/// or error (`Error`). Defaults to `Remove`.
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pub imports_not_used_as_values: ImportsNotUsedAsValues,
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/// Should the source map be inlined in the emitted code file, or provided
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/// as a separate file. Defaults to `true`.
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pub inline_source_map: bool,
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/// When transforming JSX, what value should be used for the JSX factory.
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/// Defaults to `React.createElement`.
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pub jsx_factory: String,
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/// When transforming JSX, what value should be used for the JSX fragment
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/// factory. Defaults to `React.Fragment`.
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pub jsx_fragment_factory: String,
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/// Should JSX be transformed or preserved. Defaults to `true`.
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pub transform_jsx: bool,
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}
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impl Default for EmitOptions {
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fn default() -> Self {
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EmitOptions {
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check_js: false,
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emit_metadata: false,
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imports_not_used_as_values: ImportsNotUsedAsValues::Remove,
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inline_source_map: true,
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jsx_factory: "React.createElement".into(),
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jsx_fragment_factory: "React.Fragment".into(),
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transform_jsx: true,
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}
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}
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}
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impl From<config_file::TsConfig> for EmitOptions {
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fn from(config: config_file::TsConfig) -> Self {
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let options: config_file::EmitConfigOptions =
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serde_json::from_value(config.0).unwrap();
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let imports_not_used_as_values =
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match options.imports_not_used_as_values.as_str() {
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"preserve" => ImportsNotUsedAsValues::Preserve,
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"error" => ImportsNotUsedAsValues::Error,
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_ => ImportsNotUsedAsValues::Remove,
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};
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EmitOptions {
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check_js: options.check_js,
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emit_metadata: options.emit_decorator_metadata,
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imports_not_used_as_values,
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inline_source_map: options.inline_source_map,
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jsx_factory: options.jsx_factory,
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jsx_fragment_factory: options.jsx_fragment_factory,
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transform_jsx: options.jsx == "react",
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}
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}
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}
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fn strip_config_from_emit_options(
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options: &EmitOptions,
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) -> typescript::strip::Config {
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typescript::strip::Config {
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import_not_used_as_values: match options.imports_not_used_as_values {
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ImportsNotUsedAsValues::Remove => {
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typescript::strip::ImportsNotUsedAsValues::Remove
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}
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ImportsNotUsedAsValues::Preserve => {
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typescript::strip::ImportsNotUsedAsValues::Preserve
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}
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// `Error` only affects the type-checking stage. Fall back to `Remove` here.
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ImportsNotUsedAsValues::Error => {
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typescript::strip::ImportsNotUsedAsValues::Remove
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}
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},
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use_define_for_class_fields: true,
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}
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}
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/// A logical structure to hold the value of a parsed module for further
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/// processing.
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#[derive(Clone)]
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pub struct ParsedModule {
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comments: SingleThreadedComments,
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leading_comments: Vec<Comment>,
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pub module: Module,
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pub source_map: Rc<SourceMap>,
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source_file: Rc<SourceFile>,
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}
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impl fmt::Debug for ParsedModule {
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fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
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f.debug_struct("ParsedModule")
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.field("comments", &self.comments)
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.field("leading_comments", &self.leading_comments)
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.field("module", &self.module)
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.finish()
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}
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}
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impl ParsedModule {
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/// Return a vector of dependencies for the module.
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pub fn analyze_dependencies(&self) -> Vec<DependencyDescriptor> {
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analyze_dependencies(&self.module, &self.source_map, &self.comments)
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}
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/// Get the module's leading comments, where triple slash directives might
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/// be located.
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pub fn get_leading_comments(&self) -> Vec<Comment> {
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self.leading_comments.clone()
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}
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/// Get a location for a given span within the module.
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pub fn get_location(&self, span: &Span) -> Location {
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self.source_map.lookup_char_pos(span.lo).into()
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}
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/// Transform a TypeScript file into a JavaScript file, based on the supplied
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/// options.
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///
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/// The result is a tuple of the code and optional source map as strings.
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pub fn transpile(
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self,
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options: &EmitOptions,
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) -> Result<(String, Option<String>), AnyError> {
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let program = Program::Module(self.module);
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let jsx_pass = react::react(
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self.source_map.clone(),
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Some(&self.comments),
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react::Options {
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pragma: options.jsx_factory.clone(),
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pragma_frag: options.jsx_fragment_factory.clone(),
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// this will use `Object.assign()` instead of the `_extends` helper
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// when spreading props.
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use_builtins: true,
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..Default::default()
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},
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);
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let mut passes = chain!(
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Optional::new(jsx_pass, options.transform_jsx),
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proposals::decorators::decorators(proposals::decorators::Config {
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legacy: true,
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emit_metadata: options.emit_metadata
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}),
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helpers::inject_helpers(),
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typescript::strip::strip_with_config(strip_config_from_emit_options(
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options
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)),
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fixer(Some(&self.comments)),
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hygiene(),
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);
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let program = swc_common::GLOBALS.set(&Globals::new(), || {
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helpers::HELPERS.set(&helpers::Helpers::new(false), || {
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program.fold_with(&mut passes)
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})
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});
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let mut src_map_buf = vec![];
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let mut buf = vec![];
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{
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let writer = Box::new(JsWriter::new(
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self.source_map.clone(),
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"\n",
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&mut buf,
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Some(&mut src_map_buf),
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));
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let config = swc_ecmascript::codegen::Config { minify: false };
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let mut emitter = swc_ecmascript::codegen::Emitter {
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cfg: config,
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comments: Some(&self.comments),
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cm: self.source_map.clone(),
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wr: writer,
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};
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program.emit_with(&mut emitter)?;
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}
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let mut src = String::from_utf8(buf)?;
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let mut map: Option<String> = None;
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{
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let mut buf = Vec::new();
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self
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.source_map
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.build_source_map_from(&mut src_map_buf, None)
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.to_writer(&mut buf)?;
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if options.inline_source_map {
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src.push_str("//# sourceMappingURL=data:application/json;base64,");
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let encoded_map = base64::encode(buf);
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src.push_str(&encoded_map);
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} else {
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map = Some(String::from_utf8(buf)?);
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}
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}
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Ok((src, map))
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}
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}
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pub fn parse_with_source_map(
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specifier: &str,
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source: &str,
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media_type: &MediaType,
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source_map: Rc<SourceMap>,
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) -> Result<ParsedModule, AnyError> {
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let source_file = source_map.new_source_file(
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FileName::Custom(specifier.to_string()),
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source.to_string(),
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);
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let error_buffer = ErrorBuffer::default();
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let syntax = get_syntax(media_type);
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let input = StringInput::from(&*source_file);
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let comments = SingleThreadedComments::default();
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let handler = Handler::with_emitter_and_flags(
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Box::new(error_buffer.clone()),
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HandlerFlags {
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can_emit_warnings: true,
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dont_buffer_diagnostics: true,
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..HandlerFlags::default()
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},
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);
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let lexer = Lexer::new(syntax, TARGET, input, Some(&comments));
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let mut parser = swc_ecmascript::parser::Parser::new_from(lexer);
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let sm = &source_map;
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let module = parser.parse_module().map_err(move |err| {
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let mut diagnostic = err.into_diagnostic(&handler);
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diagnostic.emit();
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DiagnosticBuffer::from_error_buffer(error_buffer, |span| {
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sm.lookup_char_pos(span.lo)
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})
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})?;
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let leading_comments =
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comments.with_leading(module.span.lo, |comments| comments.to_vec());
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Ok(ParsedModule {
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comments,
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leading_comments,
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module,
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source_map,
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source_file,
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})
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}
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/// For a given specifier, source, and media type, parse the source of the
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/// module and return a representation which can be further processed.
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///
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/// # Arguments
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///
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/// - `specifier` - The module specifier for the module.
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/// - `source` - The source code for the module.
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/// - `media_type` - The media type for the module.
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///
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// NOTE(bartlomieju): `specifier` has `&str` type instead of
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// `&ModuleSpecifier` because runtime compiler APIs don't
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// require valid module specifiers
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pub fn parse(
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specifier: &str,
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source: &str,
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media_type: &MediaType,
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) -> Result<ParsedModule, AnyError> {
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let source_map = Rc::new(SourceMap::default());
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parse_with_source_map(specifier, source, media_type, source_map)
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}
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pub enum TokenOrComment {
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Token(Token),
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Comment { kind: CommentKind, text: String },
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}
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pub struct LexedItem {
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pub span: Span,
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pub inner: TokenOrComment,
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}
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impl LexedItem {
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pub fn span_as_range(&self) -> Range<usize> {
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self.span.lo.0 as usize..self.span.hi.0 as usize
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}
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}
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fn flatten_comments(
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comments: SingleThreadedComments,
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) -> impl Iterator<Item = Comment> {
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let (leading, trailing) = comments.take_all();
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let mut comments = (*leading).clone().into_inner();
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comments.extend((*trailing).clone().into_inner());
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comments.into_iter().flat_map(|el| el.1)
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}
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pub fn lex(
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specifier: &str,
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source: &str,
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media_type: &MediaType,
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) -> Vec<LexedItem> {
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let source_map = SourceMap::default();
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let source_file = source_map.new_source_file(
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FileName::Custom(specifier.to_string()),
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source.to_string(),
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);
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let comments = SingleThreadedComments::default();
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let lexer = Lexer::new(
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get_syntax(media_type),
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TARGET,
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StringInput::from(source_file.as_ref()),
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Some(&comments),
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);
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let mut tokens: Vec<LexedItem> = lexer
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.map(|token| LexedItem {
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span: token.span,
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inner: TokenOrComment::Token(token.token),
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})
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.collect();
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tokens.extend(flatten_comments(comments).map(|comment| LexedItem {
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|
span: comment.span,
|
|
inner: TokenOrComment::Comment {
|
|
kind: comment.kind,
|
|
text: comment.text,
|
|
},
|
|
}));
|
|
|
|
tokens.sort_by_key(|item| item.span.lo.0);
|
|
|
|
tokens
|
|
}
|
|
|
|
/// A low level function which transpiles a source module into an swc
|
|
/// SourceFile.
|
|
pub fn transpile_module(
|
|
filename: &str,
|
|
src: &str,
|
|
media_type: &MediaType,
|
|
emit_options: &EmitOptions,
|
|
globals: &Globals,
|
|
cm: Rc<SourceMap>,
|
|
) -> Result<(Rc<SourceFile>, Module), AnyError> {
|
|
let parsed_module =
|
|
parse_with_source_map(filename, src, media_type, cm.clone())?;
|
|
|
|
let jsx_pass = react::react(
|
|
cm,
|
|
Some(&parsed_module.comments),
|
|
react::Options {
|
|
pragma: emit_options.jsx_factory.clone(),
|
|
pragma_frag: emit_options.jsx_fragment_factory.clone(),
|
|
// this will use `Object.assign()` instead of the `_extends` helper
|
|
// when spreading props.
|
|
use_builtins: true,
|
|
..Default::default()
|
|
},
|
|
);
|
|
let mut passes = chain!(
|
|
Optional::new(jsx_pass, emit_options.transform_jsx),
|
|
proposals::decorators::decorators(proposals::decorators::Config {
|
|
legacy: true,
|
|
emit_metadata: emit_options.emit_metadata
|
|
}),
|
|
helpers::inject_helpers(),
|
|
typescript::strip::strip_with_config(strip_config_from_emit_options(
|
|
emit_options
|
|
)),
|
|
fixer(Some(&parsed_module.comments)),
|
|
);
|
|
|
|
let source_file = parsed_module.source_file.clone();
|
|
let module = parsed_module.module;
|
|
|
|
let module = swc_common::GLOBALS.set(globals, || {
|
|
helpers::HELPERS.set(&helpers::Helpers::new(false), || {
|
|
module.fold_with(&mut passes)
|
|
})
|
|
});
|
|
|
|
Ok((source_file, module))
|
|
}
|
|
|
|
pub struct BundleHook;
|
|
|
|
impl swc_bundler::Hook for BundleHook {
|
|
fn get_import_meta_props(
|
|
&self,
|
|
span: swc_common::Span,
|
|
module_record: &swc_bundler::ModuleRecord,
|
|
) -> Result<Vec<swc_ecmascript::ast::KeyValueProp>, AnyError> {
|
|
use swc_ecmascript::ast;
|
|
|
|
// we use custom file names, and swc "wraps" these in `<` and `>` so, we
|
|
// want to strip those back out.
|
|
let mut value = module_record.file_name.to_string();
|
|
value.pop();
|
|
value.remove(0);
|
|
|
|
Ok(vec![
|
|
ast::KeyValueProp {
|
|
key: ast::PropName::Ident(ast::Ident::new("url".into(), span)),
|
|
value: Box::new(ast::Expr::Lit(ast::Lit::Str(ast::Str {
|
|
span,
|
|
value: value.into(),
|
|
kind: ast::StrKind::Synthesized,
|
|
has_escape: false,
|
|
}))),
|
|
},
|
|
ast::KeyValueProp {
|
|
key: ast::PropName::Ident(ast::Ident::new("main".into(), span)),
|
|
value: Box::new(if module_record.is_entry {
|
|
ast::Expr::Member(ast::MemberExpr {
|
|
span,
|
|
obj: ast::ExprOrSuper::Expr(Box::new(ast::Expr::MetaProp(
|
|
ast::MetaPropExpr {
|
|
meta: ast::Ident::new("import".into(), span),
|
|
prop: ast::Ident::new("meta".into(), span),
|
|
},
|
|
))),
|
|
prop: Box::new(ast::Expr::Ident(ast::Ident::new(
|
|
"main".into(),
|
|
span,
|
|
))),
|
|
computed: false,
|
|
})
|
|
} else {
|
|
ast::Expr::Lit(ast::Lit::Bool(ast::Bool { span, value: false }))
|
|
}),
|
|
},
|
|
])
|
|
}
|
|
}
|
|
|
|
#[cfg(test)]
|
|
mod tests {
|
|
use super::*;
|
|
use std::collections::HashMap;
|
|
use swc_ecmascript::dep_graph::DependencyKind;
|
|
|
|
#[test]
|
|
fn test_parsed_module_analyze_dependencies() {
|
|
let specifier = resolve_url_or_path("https://deno.land/x/mod.js").unwrap();
|
|
let source = r#"import * as bar from "./test.ts";
|
|
const foo = await import("./foo.ts");
|
|
"#;
|
|
let parsed_module =
|
|
parse(specifier.as_str(), source, &MediaType::JavaScript)
|
|
.expect("could not parse module");
|
|
let actual = parsed_module.analyze_dependencies();
|
|
assert_eq!(
|
|
actual,
|
|
vec![
|
|
DependencyDescriptor {
|
|
kind: DependencyKind::Import,
|
|
is_dynamic: false,
|
|
leading_comments: Vec::new(),
|
|
col: 0,
|
|
line: 1,
|
|
specifier: "./test.ts".into(),
|
|
specifier_col: 21,
|
|
specifier_line: 1,
|
|
import_assertions: HashMap::default(),
|
|
},
|
|
DependencyDescriptor {
|
|
kind: DependencyKind::Import,
|
|
is_dynamic: true,
|
|
leading_comments: Vec::new(),
|
|
col: 22,
|
|
line: 2,
|
|
specifier: "./foo.ts".into(),
|
|
specifier_col: 29,
|
|
specifier_line: 2,
|
|
import_assertions: HashMap::default(),
|
|
}
|
|
]
|
|
);
|
|
}
|
|
|
|
#[test]
|
|
fn test_transpile() {
|
|
let specifier = resolve_url_or_path("https://deno.land/x/mod.ts")
|
|
.expect("could not resolve specifier");
|
|
let source = r#"
|
|
enum D {
|
|
A,
|
|
B,
|
|
C,
|
|
}
|
|
|
|
export class A {
|
|
private b: string;
|
|
protected c: number = 1;
|
|
e: "foo";
|
|
constructor (public d = D.A) {
|
|
const e = "foo" as const;
|
|
this.e = e;
|
|
}
|
|
}
|
|
"#;
|
|
let module = parse(specifier.as_str(), source, &MediaType::TypeScript)
|
|
.expect("could not parse module");
|
|
let (code, maybe_map) = module
|
|
.transpile(&EmitOptions::default())
|
|
.expect("could not strip types");
|
|
assert!(code.starts_with("var D;\n(function(D) {\n"));
|
|
assert!(
|
|
code.contains("\n//# sourceMappingURL=data:application/json;base64,")
|
|
);
|
|
assert!(maybe_map.is_none());
|
|
}
|
|
|
|
#[test]
|
|
fn test_transpile_tsx() {
|
|
let specifier = resolve_url_or_path("https://deno.land/x/mod.ts")
|
|
.expect("could not resolve specifier");
|
|
let source = r#"
|
|
export class A {
|
|
render() {
|
|
return <div><span></span></div>
|
|
}
|
|
}
|
|
"#;
|
|
let module = parse(specifier.as_str(), source, &MediaType::Tsx)
|
|
.expect("could not parse module");
|
|
let (code, _) = module
|
|
.transpile(&EmitOptions::default())
|
|
.expect("could not strip types");
|
|
assert!(code.contains("React.createElement(\"div\", null"));
|
|
}
|
|
|
|
#[test]
|
|
fn test_transpile_decorators() {
|
|
let specifier = resolve_url_or_path("https://deno.land/x/mod.ts")
|
|
.expect("could not resolve specifier");
|
|
let source = r#"
|
|
function enumerable(value: boolean) {
|
|
return function (
|
|
_target: any,
|
|
_propertyKey: string,
|
|
descriptor: PropertyDescriptor,
|
|
) {
|
|
descriptor.enumerable = value;
|
|
};
|
|
}
|
|
|
|
export class A {
|
|
@enumerable(false)
|
|
a() {
|
|
Test.value;
|
|
}
|
|
}
|
|
"#;
|
|
let module = parse(specifier.as_str(), source, &MediaType::TypeScript)
|
|
.expect("could not parse module");
|
|
let (code, _) = module
|
|
.transpile(&EmitOptions::default())
|
|
.expect("could not strip types");
|
|
assert!(code.contains("_applyDecoratedDescriptor("));
|
|
}
|
|
}
|