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@putout/engine-parser
Advanced tools
Readme
🐊Putout engine that parses input.
npm i @putout/engine-parser
Any parser should be installed before use, but you can be sure that @babel/parse
always installed.
By default @putout/printer
used. It formats code according to eslint-plugin-putout
rules but without using ESLint.
But you can also use recast
or babel
with:
const ast = parse(source, {
printer: 'recast',
});
const code = print(ast, {
printer: 'recast',
});
When you need to pass options, use:
const code = print(ast, {
printer: ['putout', {
format: {
indent: ' ',
},
}],
});
Print code from ast
You can add default options
for custom parser
you use.
parse
without memoization
.
create node using memoization
.
create node without memoization
.
Extract expression
node from ExpressionStatement
.
You have two ways to benefit from source map generation:
Recast
print;Babel
generator;const source = `const hello = 'world';`;
const ast = parse(source, {
printer: 'recast',
sourceFileName: 'hello.js',
});
print(ast, {
printer: 'recast',
sourceMapName: 'hello.map',
});
// returns
`const hello = 'world';
{"version":3,"sources":["hello.js"],"names":[],"mappings":"AAAA...","file":"hello.map","sourcesContent":["const hello = 'world';"]}`;
To generate sourcemap using babel generator, you should use babel parser before.
This is low level transformation, because Babel
doesn't preserve any formatting.
const {generate} = require('@putout/engine-parser');
const babel = require('@putout/engine-parser/babel');
const ast = babel.parse(source, {
sourceFilename: 'hello.js',
});
generate(ast, {sourceMaps: true}, {
'hello.js': source,
});
// returns
({
code,
map,
});
const {parse} = require('@putout/engine-parser');
const parser = 'acorn';
const code = parse('var t = "hello"', {
parser,
});
MIT
FAQs
🐊Putout parser
We found that @putout/engine-parser demonstrated a healthy version release cadence and project activity because the last version was released less than a year ago. It has 1 open source maintainer collaborating on the project.
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