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refactor: cleanup compiler pipeline (#2686)

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* remove fetch_source_file_and_maybe_compile_async and 
  replace it with State.fetch_compiled_module

* remove SourceFile.js_source()

* introduce CompiledModule which is basically the same as
  deno::SourceInfo and represents arbitrary file that has been 
  compiled to JS module

* introduce //cli/compilers module containing all compilers

* introduce JsCompiler which is a no-op compiler
  - output is the same as input, no compilation takes place
  - it is used for MediaType::JavaScript and MediaType::Unknown

* introduce JsonCompiler that wraps JSON in default export

* support JS-to-JS compilation using checkJs
This commit is contained in:
Bartek Iwańczuk 2019-07-31 19:16:03 +02:00 • committed by Ryan Dahl
parent e7cee29c84
commit 2e1ab82321
14 changed files with 353 additions and 199 deletions
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25
js/compiler.ts
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@ -219,6 +219,8 @@ function getExtension(
}
class Host implements ts.CompilerHost {
extensionCache: Record<string, ts.Extension> = {};
private readonly _options: ts.CompilerOptions = {
allowJs: true,
allowNonTsExtensions: true,
@ -370,10 +372,16 @@ class Host implements ts.CompilerHost {
// This flags to the compiler to not go looking to transpile functional
// code, anything that is in `/$asset$/` is just library code
const isExternalLibraryImport = moduleName.startsWith(ASSETS);
const extension = getExtension(
resolvedFileName,
SourceFile.mediaType
);
this.extensionCache[resolvedFileName] = extension;
const r = {
resolvedFileName,
isExternalLibraryImport,
extension: getExtension(resolvedFileName, SourceFile.mediaType)
extension
};
return r;
} else {
@ -401,6 +409,21 @@ class Host implements ts.CompilerHost {
} else {
assert(sourceFiles != null && sourceFiles.length == 1);
const sourceFileName = sourceFiles![0].fileName;
const maybeExtension = this.extensionCache[sourceFileName];
if (maybeExtension) {
// NOTE: If it's a `.json` file we don't want to write it to disk.
// JSON files are loaded and used by TS compiler to check types, but we don't want
// to emit them to disk because output file is the same as input file.
if (maybeExtension === ts.Extension.Json) {
return;
}
// NOTE: JavaScript files are only emitted to disk if `checkJs` option in on
if (maybeExtension === ts.Extension.Js && !this._options.checkJs) {
return;
}
}
if (fileName.endsWith(".map")) {
// Source Map