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\n

p-lock

\n \n \"NPM\"\n \n \n \"TypeScript\"\n \n \n \"Coverage\n \n
\n\n
\n\n
Simple promise lock.
\n\n---\n\n\n\n## Installation\n\n
\n \n \n \"NPM\"\n \n \n\n```sh\nnpm install p-lock\n```\n\n
\n\n
\n \n \n \"Yarn\"\n \n \n\n```sh\nyarn add p-lock\n```\n\n
\n\n
\n \n \"PNPM\"\n \n\n```sh\npnpm add p-lock\n```\n\n
\n\n
\n \n \"Bun\"\n \n\n```sh\nbun add p-lock\n```\n\n
\n\n\n## About\n\nThis package provides a simple promise queue, which is useful for preventing race conditions between multiple promises.\n\n## Overview\n\nFirst, we get a lock function:\n\n```ts\nimport { getLock } from \"p-lock\";\n\nconst lock = getLock();\n```\n\nCalling the lock function returns a promise that resolves when it reaches the front of the queue.\n\nThe promise resolves with a release function, which must be called to continue the queue:\n\n```ts\nlock(\"example-key\").then((release) => {\n // Now this callback is at the front of the queue for \"example-key\"\n // do something...\n release();\n});\n```\n\n## Full Example\n\nIn this example, we have two promises writing to the same file. However, we want to ensure that the first one finishes before the second one starts.\n\n```ts\nimport { writeFile } from \"fs\";\nimport { getLock } from \"p-lock\";\n\nconst lock = getLock();\n\nlock(\"file\").then((release) => {\n setTimeout(() => {\n writeFile(\"test.txt\", \"hello\", () => {\n release();\n });\n }, 1000);\n});\n\nlock(\"file\").then((release) => {\n writeFile(\"test.txt\", \"world\", () => {\n release();\n });\n});\n\n// Contents of test.txt will be \"world\"\n```\n\n### Replace\n\nIn some cases, we may want to replace an existing promise waiting for a lock, rather than waiting for it to finish.\n\nThe `replace` option allows us to do this:\n\n```ts\nimport { writeFile } from \"fs\";\nimport { getLock } from \"p-lock\";\n\nconst lock = getLock({ replace: true });\n\nlet writeCounter = 0;\n\nlock(\"file\").then((release) => {\n setTimeout(() => {\n writeCounter += 1;\n writeFile(\"test.txt\", `update #${writeCounter}`, () => {\n release();\n });\n }, 1000);\n});\n\nlock(\"file\").then((release) => {\n writeCounter += 1;\n writeFile(\"test.txt\", `update #${writeCounter}`, () => {\n release();\n });\n}).catch(() => {\n // This promise will reject, since the next one replaces.\n});\n\nlock(\"file\").then((release) => {\n writeCounter += 1;\n writeFile(\"test.txt\", `update #${writeCounter}`, () => {\n release();\n });\n});\n\n// Contents of test.txt will be \"update #2\"\n```\n\n\n

License \"license\"

\n\n[MIT](https://opensource.org/licenses/MIT) - _MIT License_\n\n","readmeFilename":"README.md"}