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module.exports = function basicIdentifierReplacerPlugin({ types: t }) {
function IdentifierVisitor(path, { opts }) {
if ( Object.prototype.hasOwnProperty.call(opts, path.node.name) ) {
const replacement = opts[path.node.name];
if (
path.parent.type === 'UnaryExpression'
&& path.parent.operator === 'typeof'
&& path.parentPath.parent.type === 'BinaryExpression'
//&& path.parentPath.parent.operator === '!=='
&& path.parentPath.parent.right.type === 'StringLiteral'
&& path.parentPath.parent.right.value === 'undefined'
) {
//require('inspector').url() || require('inspector').open(null, null, true); debugger;
// typeof undefined === 'undefined'
if ( replacement === 'undefined' && path.parentPath.parent.operator === '===' )
return void path.parentPath.parentPath.replaceWithSourceString('true');
// typeof undefined !== 'undefined'
if ( replacement === 'undefined' && path.parentPath.parent.operator === '!==' )
return void path.parentPath.parentPath.replaceWithSourceString('false');
// match: typeof XXX !== 'undefined'
if ( path.parentPath.parent.operator === '!==' )
return void path.parentPath.parentPath.replaceWithSourceString('true');
// match: typeof XXX === 'undefined'
if ( path.parentPath.parent.operator === '===' )
return void path.parentPath.parentPath.replaceWithSourceString('false');
throw new Error('case not yet handled');
}
// https://github.com/jamiebuilds/babel-handbook/blob/master/translations/en/plugin-handbook.md#replacing-a-node-with-a-source-string
//require('inspector').url() || require('inspector').open(null, null, true); debugger;
path.replaceWithSourceString(replacement);
}
}
return {
visitor: {
Program: {
enter(path, state) {
path.traverse({
Identifier: IdentifierVisitor
}, state);
},
},
}
};
}