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perf: use Set instead of string indexOf

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This commit is contained in:
Daniel Tschinder 2019-01-15 12:58:59 -08:00
parent a7757ec4d0
commit e4b8cfc768
1 changed files with 2 additions and 2 deletions
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4
packages/babel-parser/src/tokenizer/index.js
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@ -20,7 +20,7 @@ import {
} from "../util/whitespace";
import State from "./state";
const VALID_REGEX_FLAGS = "gmsiyu";
const VALID_REGEX_FLAGS = new Set(["g", "m", "s", "i", "y", "u"]);
// The following character codes are forbidden from being
// an immediate sibling of NumericLiteralSeparator _
@ -874,7 +874,7 @@ export default class Tokenizer extends LocationParser {
const char = this.state.input[this.state.pos];
const charCode = this.state.input.codePointAt(this.state.pos);
if (VALID_REGEX_FLAGS.indexOf(char) > -1) {
if (VALID_REGEX_FLAGS.has(char)) {
if (mods.indexOf(char) > -1) {
this.raise(this.state.pos + 1, "Duplicate regular expression flag");
}