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Spec Violation: Fix var initializer in for-in loop (#7392)

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This commit is contained in:
K Sashi Kumar
2018-03-05 05:48:32 +05:30
committed by Logan Smyth
parent fc64ab5725
commit d187c26748
16 changed files with 932 additions and 3 deletions
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15
packages/babylon/src/parser/statement.js
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@@ -367,8 +367,19 @@ export default class StatementParser extends ExpressionParser {
this.finishNode(init, "VariableDeclaration");
if (this.match(tt._in) || this.isContextual("of")) {
if (init.declarations.length === 1 && !init.declarations[0].init) {
return this.parseForIn(node, init, forAwait);
if (init.declarations.length === 1) {
const declaration = init.declarations[0];
const isForInInitializer =
varKind === tt._var &&
declaration.init &&
declaration.id.type != "ObjectPattern" &&
declaration.id.type != "ArrayPattern" &&
!this.isContextual("of");
if (this.state.strict && isForInInitializer) {
this.raise(this.state.start, "for-in initializer in strict mode");
} else if (isForInInitializer || !declaration.init) {
return this.parseForIn(node, init, forAwait);
}
}
}
if (forAwait) {