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lib/run-tests/transpile.js
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| const babel = require("@babel/core"); | ||
| const { default: loadConfig } = require("@babel/core/lib/config"); | ||
| const { runSync } = require("@babel/core/lib/transformation"); |
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We shouldn't use internal API if possible. I think that if you use the public loadOptions and transformSync we will still get a good improvement because the resolved plugin/preset descriptors are cached.
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In this PR we improve the transpiler implementation by caching the configuration object. Compared to the master branch, the running time of
node lib/run-tests async-functionis reduced from 97s to 93s on my local machine.