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2cc587f3f4
Summary:
This changes the way that module identifiers are replaced with numeric ids so that ids are padded with spaces on the right to take up the same space as the original string literal.
By doing this, we keep the mappings for the generated source line intact.
```
// original source
const React = require('react');
// old replacement
const React = require(12 /* react */);
// new replacement
const React = require(12 ); // 12 = react
```
The remaining edge case are module names that are replaced with numeric IDs that are longer than the replaced string, e.g.:
```
const Q = require('q');
const Q = require(1234);
```
Reviewed By: cpojer
Differential Revision: D4346092
fbshipit-source-id: ef3bb879495f388c4a7448a2f810b83c204e8984