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perf: Check for plugin only once before looping

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This commit is contained in:
Daniel Tschinder 2019-01-16 02:11:46 -08:00
parent 10555c719e
commit 3a3d5cbe9c
1 changed files with 2 additions and 1 deletions
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3
packages/babel-parser/src/parser/statement.js
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@ -865,6 +865,7 @@ export default class StatementParser extends ExpressionParser {
kind: TokenType, kind: TokenType,
): N.VariableDeclaration { ): N.VariableDeclaration {
const declarations = (node.declarations = []); const declarations = (node.declarations = []);
const isTypescript = this.hasPlugin("typescript");
// $FlowFixMe // $FlowFixMe
node.kind = kind.keyword; node.kind = kind.keyword;
for (;;) { for (;;) {
@ -879,7 +880,7 @@ export default class StatementParser extends ExpressionParser {
) { ) {
// `const` with no initializer is allowed in TypeScript. // `const` with no initializer is allowed in TypeScript.
// It could be a declaration like `const x: number;`. // It could be a declaration like `const x: number;`.
if (!this.hasPlugin("typescript")) { if (!isTypescript) {
this.unexpected(); this.unexpected();
} }
} else if ( } else if (