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perf: replace lookahead by lookaheadCharCode (#10371)

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* perf: replace lookahead by lookaheadCharCode

* fix: flow ignore

* refactor: add nextTokenStart method

* refactor: duplicated isNewLine code

* refactor: remove lookahead usage from babylon core
This commit is contained in:
Huáng Jùnliàng
2019-10-08 13:09:05 -04:00
committed by Nicolò Ribaudo
parent bc0966a46f
commit 0856618ed5
5 changed files with 62 additions and 49 deletions
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9
packages/babel-parser/src/plugins/typescript/index.js
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@@ -19,6 +19,7 @@ import {
BIND_CLASS,
} from "../../util/scopeflags";
import TypeScriptScopeHandler from "./scope";
import * as charCodes from "charcodes";
type TsModifier =
| "readonly"
@@ -657,7 +658,10 @@ export default (superClass: Class<Parser>): Class<Parser> =>
: this.match(tt._null)
? "TSNullKeyword"
: keywordTypeFromName(this.state.value);
if (type !== undefined && this.lookahead().type !== tt.dot) {
if (
type !== undefined &&
this.lookaheadCharCode() !== charCodes.dot
) {
const node: N.TsKeywordType = this.startNode();
this.next();
return this.finishNode(node, type);
@@ -1203,7 +1207,8 @@ export default (superClass: Class<Parser>): Class<Parser> =>
tsIsExternalModuleReference(): boolean {
return (
this.isContextual("require") && this.lookahead().type === tt.parenL
this.isContextual("require") &&
this.lookaheadCharCode() === charCodes.leftParenthesis
);
}