pkgs.writeText

The following is the current implementation of this function.

writeText =
    name: text:
    # TODO: To fully deprecate, replace the assertion with `lib.isString` and remove the warning
    assert lib.assertMsg (lib.strings.isConvertibleWithToString text)
      "pkgs.writeText ${lib.strings.escapeNixString name}: The second argument should be a string, but it's a ${builtins.typeOf text} instead.";
    lib.warnIf (!lib.isString text)
      "pkgs.writeText ${lib.strings.escapeNixString name}: The second argument should be a string, but it's a ${builtins.typeOf text} instead, which is deprecated. Use `toString` to convert the value to a string first."
      writeTextFile
      { inherit name text; };