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Fixes microsoft/monaco-editor#2822

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This commit is contained in:
Alexandru Dima
2021-12-14 16:41:26 +01:00
parent 25ef7a83fc
commit 7d5de2d449
3 changed files with 55 additions and 3 deletions
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27
build/lib/treeshaking.ts
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@@ -327,6 +327,29 @@ function isSymbolWithDeclarations(symbol: ts.Symbol | undefined | null): symbol
return !!(symbol && symbol.declarations);
}
function isVariableStatementWithSideEffects(ts: typeof import('typescript'), node: ts.Node): boolean {
if (!ts.isVariableStatement(node)) {
return false;
}
let hasSideEffects = false;
const visitNode = (node: ts.Node) => {
if (hasSideEffects) {
// no need to go on
return;
}
if (ts.isCallExpression(node)) {
// TODO: assuming `createDecorator` and `refineServiceDecorator` calls are side-effect free
const isSideEffectFree = /(createDecorator|refineServiceDecorator)/.test(node.getText());
if (!isSideEffectFree) {
hasSideEffects = true;
}
}
node.forEachChild(visitNode);
};
node.forEachChild(visitNode);
return hasSideEffects;
}
function markNodes(ts: typeof import('typescript'), languageService: ts.LanguageService, options: ITreeShakingOptions) {
const program = languageService.getProgram();
if (!program) {
@@ -372,6 +395,10 @@ function markNodes(ts: typeof import('typescript'), languageService: ts.Language
return;
}
if (isVariableStatementWithSideEffects(ts, node)) {
enqueue_black(node);
}
if (
ts.isExpressionStatement(node)
|| ts.isIfStatement(node)