Parser API numericLiteralFlags numeric literal flag
Suggestion
Currently the parser API apparently does not expose numericLiteralFlags for determining whether the original source is written using features such as binary or octal literal.
I have to do this to determine whether the original source was written using ECMAScript 2015 numeric literal:
if (TypeScript.isNumericLiteral(node)) {
let bitflag = node['numericLiteralFlags'];
if (bitflag) {
if (bitflag & (1 << 8)) {
// internal flag: Octal
// https://github.com/Microsoft/TypeScript/blob/a4a1bed88bdcb160eff032790f05629f9fa955b4/src/compiler/types.ts#L1659
return true;
}
if (bitflag & (1 << 7)) {
// internal flag: Binary
// https://github.com/Microsoft/TypeScript/blob/a4a1bed88bdcb160eff032790f05629f9fa955b4/src/compiler/types.ts#L1658
return true;
}
}
}
AFAIK this is the only way to check it since node.text evaluates to the string representation of the base 10 number...
node_modules may contain packages not distributed in ES5, which can cause minification error when being minified with minifier not capable of handling ES5, or worse, ninja runtime error. (I want to parse packages / libraries with TypeScript API, then transpile them only when necessary for fast build. Rather than transpiling everything)
Search Terms
Parser API numericLiteralFlags numeric literal flag
Suggestion
Currently the parser API apparently does not expose
numericLiteralFlags
for determining whether the original source is written using features such as binary or octal literal.I have to do this to determine whether the original source was written using ECMAScript 2015 numeric literal:
AFAIK this is the only way to check it since
node.text
evaluates to the string representation of the base 10 number...Use Cases
I need this 'internal' API to write a parser for helping determine whether a JS file is compatible with syntax of certain ECMAScript version. For example: Can this script run in ES5 environments?
node_modules
may contain packages not distributed in ES5, which can cause minification error when being minified with minifier not capable of handling ES5, or worse, ninja runtime error. (I want to parse packages / libraries with TypeScript API, then transpile them only when necessary for fast build. Rather than transpiling everything)Examples
Simple proposed API:
Checklist
My suggestion meets these guidelines: