Kong/insomnia · error

Merges with additions are not supported yet.

Error message

Merges with additions are not supported yet.

What it means

Translated isomorphic-git MergeNotSupportedError from GitVCS.merge: isomorphic-git cannot perform a merge that requires adding new files (limited merge support), so the operation is surfaced as unsupported rather than silently corrupting state.

Solutions

  1. Perform the merge outside Insomnia with a full git client, then sync
  2. Reorganize branches so the merge does not introduce new files from the other side
Defensive patterns

Strategy: fallback

When it happens

Trigger: Thrown at packages/insomnia/src/sync/git/git-vcs.ts:1924 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of Kong/insomnia@d9bb2b0142 (2026-08-26). Data as JSON: /api/errors/a82288e7f6608966. Report an issue: GitHub.

Appendix: source

Thrown at packages/insomnia/src/sync/git/git-vcs.ts:1924

    ) {
      this._baseOpts.fs.startCollectWriteAction(writeFileMap);
    }
    return git
      .merge({
        ...this._baseOpts,
        ours: oursBranch,
        theirs: theirsBranch,
        abortOnConflict: false,
      })
      .catch(async err => {
        if (err instanceof git.Errors.MergeConflictError) {
          return await this.collectMergeConflicts(err, oursBranch, theirsBranch, writeFileMap);
        }

        if (err instanceof git.Errors.MergeNotSupportedError) {
          const errorMessage = 'Merges with additions are not supported yet.';

          throw new Error(errorMessage);
        }

        throw err;
      })
      .finally(() => {
        if (
          'stopCollectWriteAction' in this._baseOpts.fs &&
          typeof this._baseOpts.fs.stopCollectWriteAction === 'function'
        ) {
          this._baseOpts.fs.stopCollectWriteAction();
        }
      });
  }

  async fetch({
    singleBranch,
    depth,
    credentialsId,

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