ESM and CommonJS Differences and Interoperability
Explore the differences between Node.js ESM and CommonJS modules, including strict mode behavior, missing references, and file path handling. Understand techniques for interoperability such as recreating require in ESM and importing CommonJS modules. This lesson equips you to work smoothly across both module systems and handle common integration challenges.
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We already mentioned several important differences between ESM and CommonJS, such as having to explicitly specify file extensions in imports with ESM, while file extensions are totally optional with the CommonJS require function.
Let's close this chapter by discussing some other important differences between ESM and CommonJS and how the two module systems can work together when necessary.
ESM runs in strict mode
ES modules run implicitly in strict mode. This means that we don’t have to explicitly add the "use strict" statements at the beginning of every file. Strict mode cannot be disabled; therefore, ...