toml-v1 
A TOML parser compatible with TOML version v1.0.0.
This package passes the TOML test suite, except for a few tests that fall into these categories:
- Tests for 64-bit integers (JavaScript numbers only have 53 bits of precision)
- Tests for detecting invalid UTF-8 (not applicable to JavaScript strings)
It has the additional ability to track the source locations of keys and values after parsing (see below).
Installation
npm install toml-v1
Requires Node.js v14.x.x or later.
Usage
import { parse } from 'toml-v1';
const data = parse('[foo]\nbar = 123');
assert(data.foo.bar === 123);Parsing dates
TOML defines four types of dates:
This package defines these types as subclasses of Date. The OffsetDateTime subclass is functionally equivalent to Date, but its timezone information is not forgotten. The other classes contain incomplete date/time information, so some of their methods are disabled. For example, calling .getFullYear() on LocalTime will throw an error.
import { LocalTime } from 'toml-v1';
const localTime = new LocalTime('12:42:42');
assert(localTime.getHours() === 12);
assert(localTime.toString() === '12:42:42');Source tracking
By using the SourceTracker, you can retrieve Source objects corresponding to each key and value in the TOML file.
import { parser, SourceTracker } from 'toml-v1';
const tracker = new SourceTracker();
const data = parse('[foo]\nbar = 123', 'example.toml', tracker);
const keySource = tracker.getKeySource(data.foo, 'bar');
const valueSource = tracker.getValueSource(data.foo, 'bar');
assert(keySource.start === 6);
assert(keySource.end === 9);
assert(valueSource.start === 12);
assert(valueSource.end === 15);