Method appendFile

packages/shell/src/filesystem.ts:938–988

(
    path: string,
    content: string,
    mimeType = "text/plain"
  )

  }

  async appendFile(
    path: string,
    content: string,
    mimeType = "text/plain"
  ): Promise<void> {
    await this.ensureInit();
    const normalized = await this.resolveSymlink(normalizePath(path));
    const T = this.tableName;

    const row = (
      await this.sql.query<{
        type: string;
        storage_backend: string;
        content_encoding: string;
      }>(
        `SELECT type, storage_backend, content_encoding
        FROM ${T} WHERE path = ?`,
        normalized
      )
    )[0];

    if (!row) {
      await this.writeFile(path, content, mimeType);
      return;
    }

    if (row.type !== "file") {
      throw new Error(`EISDIR: ${path} is a directory`);
    }

    if (row.storage_backend === "inline" && row.content_encoding === "utf8") {
      const appendSize = TEXT_ENCODER.encode(content).byteLength;
      const now = Math.floor(Date.now() / 1000);
      await this.sql.run(
        `UPDATE ${T} SET
          content = content || ?,
          size = size + ?,
          modified_at = ?
        WHERE path = ?`,
        content,
        appendSize,
        now,
        normalized
      );
      this.emit("update", normalized, "file");
      return;
    }

    const existing = await this.readFile(path);
    await this.writeFile(path, (existing ?? "") + content, mimeType);
  }

  async deleteFile(path: string): Promise<boolean> {
    await this.ensureInit();