fix(tsc): config resolution using relative paths (#7392)

cli/tests/compiler_api_test.ts

@@ -75,6 +75,24 @@ Deno.test({
   },
 });
 
+Deno.test({
+  name: "Deno.compile() - pass outDir in compiler options",
+  async fn() {
+    const [diagnostics, actual] = await Deno.compile(
+      "src/foo.ts",
+      {
+        "src/foo.ts": "console.log('Hello world')",
+      },
+      {
+        outDir: "./lib",
+      },
+    );
+    assert(diagnostics == null);
+    assert(actual);
+    assertEquals(Object.keys(actual), ["lib/foo.js.map", "lib/foo.js"]);
+  },
+});
+
 Deno.test({
   name: "Deno.compile() - properly handles .d.ts files",
   async fn() {

cli/tsc/99_main_compiler.js

@@ -299,6 +299,7 @@ delete Object.prototype.__proto__;
   // it makes sense to use the same scheme here.
   const ASSETS = "asset://";
   const OUT_DIR = "deno://";
+  const CACHE = "cache:///";
   // This constant is passed to compiler settings when
   // doing incremental compiles. Contents of this
   // file are passed back to Rust and saved to $DENO_DIR.
@@ -382,13 +383,10 @@ delete Object.prototype.__proto__;
   const RESOLVED_SPECIFIER_CACHE = new Map();
 
   function parseCompilerOptions(compilerOptions) {
-    // TODO(bartlomieju): using `/` and `/tsconfig.json` because
-    // otherwise TSC complains that some paths are relative
-    // and some are absolute
     const { options, errors } = ts.convertCompilerOptionsFromJson(
       compilerOptions,
-      "/",
-      "/tsconfig.json",
+      "",
+      "tsconfig.json",
     );
     return {
       options,
@@ -491,7 +489,7 @@ delete Object.prototype.__proto__;
     }
 
     getCurrentDirectory() {
-      return "";
+      return CACHE;
     }
 
     getDefaultLibFileName(_options) {
@@ -1333,7 +1331,6 @@ delete Object.prototype.__proto__;
       target,
       createRuntimeCompileWriteFile(state),
     );
-
     const program = ts.createProgram({
       rootNames,
       options: host.getCompilationSettings(),