safe-identifier

Sanitize strings for use as JavaScript identifiers & property names.

npm install --save safe-identifier

import { identifier, property } from 'safe-identifier'

identifier('Foo') === 'Foo'
identifier('enum') === '_enum'
identifier('my var', true) === 'my_var_hk17pp'
identifier(' my \0var ', true) === 'my_var_1d8fi3'

property('Foo', 'bar') === 'Foo.bar'
property('Foo', 'bar\nbar') === 'Foo["bar\\nbar"]'
property(null, 'foo') === 'foo'
property(null, 'void') === '"void"'

identifier(key: string, unique: boolean): string

Sanitize a string for use as an identifier name

Replaces invalid character sequences with _ and may add a _ prefix if the resulting name would conflict with a JavaScript reserved name, covering all standards from ES3 up to ES2018, along with current active proposals.

If unique is true, a 32-bit hash of the key is appended to the result in order to help ensure that different inputs produce different outputs.

property(obj: string?, key: string): string

Sanitize a string for use as a property name

By default uses obj.key notation, falling back to obj["key"] if the key contains invalid characters or is an ECMAScript 3rd Edition reserved word (required for IE8 compatibility). If obj is empty, returns only the possibly quoted property key. The correctness of obj is not checked.