babel-plugin-program-metadata-literals

const script = `
'use strict';
'abc: def';
'Foo:    Bar   Baz    ';
'Foo: quux';
'Empty:'

function doStuff() {
    'Oof: Zab Rab';
    'Foo: quux';
}
`;

const result = babel.transform(script, {plugins: [programMetadataLiteralPlugin]});

assert.deepEqual(result.metadata.programMetaDataLiterals, [
    {key: 'abc', value: 'def'},
    {key: 'Foo', value: 'Bar   Baz'},
    {key: 'Foo', value: 'quux'},
    {key: 'Empty', value: ''},
    {key: 'Oof', value: 'Zab Rab'},
    {key: 'Foo', value: 'quux'},
]);