This commit provides a "system_loader_es5.js" bundle loader which will be added
to the bundle when the target is < ES2017, which is the minimum target syntax
required for "system_loader.js".
Supports #5913 (via Deno.bundle()) with a couple caveats:
* Allowing "deno bundle" to take a different target is not supported, as we
specifically ignore "target" when passed in a TypeScript config file. This is
because deno bundle is really intended to generate bundles that work in Deno.
It is an unintentional side effect that some bundles are loadable in browsers.
* While a target of "es3" will be accepted, the module loader will still only be
compatible with ES5 or later. Realistically no one should be expecting bundles
generated by Deno to be used on IE8 and prior, and there is just too much
"baggage" to support that at this point.
Since everything that Deno loads is treated as an ES Module,
it means that all code is treated as "use strict" except for
when using the REPL. This PR changes that so code in the
REPL is also always evaluated with "use strict". There are
also a couple other places where we load code as scripts
which should also use "use strict" just in case.
This commit updates "deno_typescript" crate to properly map
bundle entrypoint file to internal specifier.
All import specifiers were remapped from "file:///a/b/c.ts" to
"$deno$/a/b/c.ts", but that was not the case for entrypoint file
"main.ts" and "compiler.ts".
Because of that internal stack traces were inconsistent; showing
"file:///some/random/path/on/ci/machine.ts" URL in frames that
originate from "main.ts" or "compiler.ts" and "$deno$/file.ts"
for all other imports.
The V8 documentation explicitly states that SnapshotCreator::CreateBlob()
should not be called from within a HandleScope.
Additionally, this patch removes some non-functional error handling code
from the deno_core::Isolate::snapshot() method.
Previously, bundles always utilised top level await, even if the bundled
modules didn't require top level await. Now, analysis of the bundle is
done and if none of the bundled modules are asynchronously executed,
then the bundle as a whole will be synchronously executed.
Fixes #4055
Fixes #4123
