microsoft/TypeScript
1
0
Fork 0
mirror of https://github.com/microsoft/TypeScript.git synced 2026-02-05 08:11:30 -06:00
Code Issues Packages Projects Releases 212 Wiki Activity

Preserve initializer.

Browse Source
This commit is contained in:
Daniel Rosenwasser 2015-06-23 15:05:33 -07:00
parent b159944f0a
commit 60ed259a90
1 changed files with 20 additions and 9 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

29
src/compiler/emitter.ts
View File

@ -3142,30 +3142,41 @@ var __param = (this && this.__param) || function (paramIndex, decorator) {
return;
}
let paramName = parameter.name;
let { name: paramName, initializer } = parameter;
if (isBindingPattern(paramName)) {
// In cases where a binding patternm is simply '[]' or '{}',
// we don't want to emit anything.
if (paramName.elements.length > 0) {
// In cases where a binding pattern is simply '[]' or '{}',
// we usually don't want to emit a var declaration; however, in the presence
// of an initializer, we must emit that expression to preserve side effects.
let hasBindingElements = paramName.elements.length > 0;
if (hasBindingElements || initializer) {
writeLine();
write("var ");
emitDestructuring(parameter, /*isAssignmentExpressionStatement*/ false, tempParameters[tempIndex]);
if (hasBindingElements) {
emitDestructuring(parameter, /*isAssignmentExpressionStatement*/ false, tempParameters[tempIndex]);
}
else {
emit(tempParameters[tempIndex]);
write(" = ");
emit(initializer);
}
write(";");
tempIndex++;
}
}
else if (parameter.initializer) {
else if (initializer) {
writeLine();
emitStart(parameter);
write("if (");
emitNodeWithoutSourceMap(parameter.name);
emitNodeWithoutSourceMap(paramName);
write(" === void 0)");
emitEnd(parameter);
write(" { ");
emitStart(parameter);
emitNodeWithoutSourceMap(parameter.name);
emitNodeWithoutSourceMap(paramName);
write(" = ");
emitNodeWithoutSourceMap(parameter.initializer);
emitNodeWithoutSourceMap(initializer);
emitEnd(parameter);
write("; }");
}