Created
November 7, 2019 01:46
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babel plugin to instrument promises with performance marks
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| const { relative } = require('path'); | |
| module.exports = babel => { | |
| const { | |
| types: { | |
| stringLiteral, | |
| callExpression, | |
| identifier, | |
| isMemberExpression, | |
| isCallExpression, | |
| isIdentifier, | |
| }, | |
| } = babel; | |
| return { | |
| name: 'babel-plugin-instrument-promises', | |
| visitor: { | |
| CallExpression(path, state) { | |
| try { | |
| const { node } = path; | |
| if (isMemberExpression(node.callee)) { | |
| const { name } = node.callee.property; | |
| const decorator = state.opts[name]; | |
| const isRelevant = | |
| ['then', 'catch', 'finally'].includes(name) && | |
| typeof decorator === 'string' && | |
| node.arguments.length === 1 && | |
| node.arguments[0].loc; | |
| if (isRelevant) { | |
| const [arg] = node.arguments; | |
| const isAlreadyInstrumented = | |
| isCallExpression(arg) && | |
| isIdentifier(arg.callee) && | |
| arg.callee.name === decorator; | |
| if (!isAlreadyInstrumented) { | |
| const { sourceFileName, root } = state.file.opts; | |
| const { line, column } = arg.loc.start; | |
| const source = relative(root, sourceFileName); | |
| node.arguments = [ | |
| callExpression(identifier(decorator), [ | |
| stringLiteral(`${source}:${line}:${column}`), | |
| arg, | |
| ]), | |
| ]; | |
| } | |
| } | |
| } | |
| } catch (error) { | |
| console.error(error); | |
| } | |
| }, | |
| }, | |
| }; | |
| }; |
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