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Optimize external source maps without full cache (#40130)

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Joost Koehoorn 2020-08-20 01:05:32 +02:00 committed by GitHub
parent 55ca5e91b9
commit 2f2b679436
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GPG key ID: 4AEE18F83AFDEB23
1 changed files with 19 additions and 1 deletions
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20
src/compiler/emitter.ts
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@ -862,6 +862,8 @@ namespace ts {
let sourceMapGenerator: SourceMapGenerator | undefined;
let sourceMapSource: SourceMapSource;
let sourceMapSourceIndex = -1;
let mostRecentlyAddedSourceMapSource: SourceMapSource;
let mostRecentlyAddedSourceMapSourceIndex = -1;
// Comments
let containerPos = -1;
@ -5337,9 +5339,10 @@ namespace ts {
function emitSourcePos(source: SourceMapSource, pos: number) {
if (source !== sourceMapSource) {
const savedSourceMapSource = sourceMapSource;
const savedSourceMapSourceIndex = sourceMapSourceIndex;
setSourceMapSource(source);
emitPos(pos);
setSourceMapSource(savedSourceMapSource);
resetSourceMapSource(savedSourceMapSource, savedSourceMapSourceIndex);
}
else {
emitPos(pos);
@ -5386,6 +5389,13 @@ namespace ts {
sourceMapSource = source;
if (source === mostRecentlyAddedSourceMapSource) {
// Fast path for when the new source map is the most recently added, in which case
// we use its captured index without going through the source map generator.
sourceMapSourceIndex = mostRecentlyAddedSourceMapSourceIndex;
return;
}
if (isJsonSourceMapSource(source)) {
return;
}
@ -5394,6 +5404,14 @@ namespace ts {
if (printerOptions.inlineSources) {
sourceMapGenerator!.setSourceContent(sourceMapSourceIndex, source.text);
}
mostRecentlyAddedSourceMapSource = source;
mostRecentlyAddedSourceMapSourceIndex = sourceMapSourceIndex;
}
function resetSourceMapSource(source: SourceMapSource, sourceIndex: number) {
sourceMapSource = source;
sourceMapSourceIndex = sourceIndex;
}
function isJsonSourceMapSource(sourceFile: SourceMapSource) {