angular-cn/aio/tools/transforms/angular-api-package/processors/extractPipeParams.js

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module.exports = function extractPipeParams(createDocMessage) {
return {
$runAfter: ['extractDecoratedClassesProcessor'],
$runBefore: ['docs-processed'],
$process(docs) {
docs.forEach(doc => {
if (doc.docType === 'pipe') {
const transformFn = doc.members && doc.members.find(member => member.name === 'transform');
if (!transformFn) {
throw new Error(createDocMessage('Missing `transform` method - pipes must implement PipeTransform interface', doc));
}
doc.pipeName = doc.pipeOptions.name.replace(/^["']|["']$/g, '');
doc.valueParam = transformFn.parameterDocs[0];
doc.pipeParams = transformFn.parameterDocs.slice(1);
}
});
}
};
};