v2.0.0

The compatibility promise. Every call with three strings (or String objects) and an integer position from 0 to the text's length returns exactly what 1.0.4 returned, and require('replace-string-at-position') still returns the function. The test suite checks this against 71 answers recorded from the published 1.0.4, on both builds and every supported Node line. Every other call now throws. Those calls are listed under Changed. Most of them returned damaged text, but a few happened to give a sensible answer, and those throw now too: a number as newString (('item #0', '0', 5, 6) gave 'item #5'), a Number object or true as the position, an array such as ['b'] as sourceString. Convert such arguments with String() or Number() first. A String object is read by its own string value: an overridden valueOf, Symbol.toPrimitive or substring on it is ignored, and a Proxy is refused, where 1.0.4 called them.

Changed (breaking)

• Needs Node 20 or later. The package has an exports map, so deep imports such as replace-string-at-position/index.js no longer resolve; import the package by its name.
• A missing or non-number position throws a TypeError. 1.0.4 returned the text twice for a missing position (('abc', 'b', 'X') gave 'abcXabc'), and joined a string position as text ('1' gave 'aX' for 'abcdef'). Booleans, null, arrays, BigInts and Number objects are refused as well.
• A negative, NaN or fractional position throws a RangeError. 1.0.4 spliced negative and NaN positions at the start and removed the wrong number of characters, and it truncated fractions.
• A position greater than the text's length throws a RangeError. 1.0.4 appended the new text at the end.
• Every text argument must be a string or a String object, otherwise a TypeError names the argument. 1.0.4 put null, undefined, numbers and objects into the result as text ('anullcdef'), read the length of arrays and array-likes, and failed with the engine's own error for a null or non-string first argument.
• The command-line tool that the old README described is gone. It was never installed, because the package had no bin entry.

Added

• ES module build with a default export and the named export replaceStringAtPosition.
• The CommonJS function also carries .default and .replaceStringAtPosition, both pointing to itself.
• TypeScript declarations for both builds.
• Runs in browsers, Bun, Deno and workers: the package uses no Node or DOM APIs.
• Published from GitHub Actions through npm trusted publishing, with provenance.

Kept

• The text at the position is not compared with sourceString; only its length counts, and a sourceString that runs past the end removes the rest of the text.
• Positions and lengths count UTF-16 code units, as String.prototype.slice does, so a position inside an emoji splits it.
• Extra arguments are ignored.