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install/config-ui/node_modules/stable-hash/README.md

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+# stable-hash
+
+A tiny and fast (481b <sup>[unpkg](https://unpkg.com/stable-hash@0.0.3/dist/index.mjs)</sup>) lib for "stably hashing" a JavaScript value. Originally created for [SWR](https://github.com/vercel/swr).
+
+It's similar to `JSON.stringify(value)`, but:
+1. Supports any JavaScript value (BigInt, NaN, Symbol, function, class, ...)
+2. Sorts object keys (stable)
+3. Supports circular objects
+
+## Use
+
+```bash
+yarn add stable-hash
+```
+
+```js
+import hash from 'stable-hash'
+
+hash(anyJavaScriptValueHere) // returns a string
+```
+
+## Examples
+
+### Primitive Value
+
+```js
+hash(1)
+hash('foo')
+hash(true)
+hash(undefined)
+hash(null)
+hash(NaN)
+```
+
+BigInt:
+
+```js
+hash(1) === hash(1n)
+hash(1) !== hash(2n)
+```
+
+Symbol:
+
+```js
+hash(Symbol.for('foo')) === hash(Symbol.for('foo'))
+hash(Symbol.for('foo')) === hash(Symbol('foo'))
+hash(Symbol('foo')) === hash(Symbol('foo'))
+hash(Symbol('foo')) !== hash(Symbol('bar'))
+```
+
+_Since Symbols cannot be serialized, stable-hash simply uses its description as the hash._
+
+### Regex
+
+```js
+hash(/foo/) === hash(/foo/)
+hash(/foo/) !== hash(/bar/)
+```
+
+### Date
+
+```js
+hash(new Date(1)) === hash(new Date(1))
+```
+
+### Array
+
+```js
+hash([1, '2', [new Date(3)]]) === hash([1, '2', [new Date(3)]])
+hash([1, 2]) !== hash([2, 1])
+```
+
+Circular:
+
+```js
+const foo = []
+foo.push(foo)
+hash(foo) === hash(foo)
+```
+
+### Object
+
+```js
+hash({ foo: 'bar' }) === hash({ foo: 'bar' })
+hash({ foo: { bar: 1 } }) === hash({ foo: { bar: 1 } })
+```
+
+Stable:
+
+```js
+hash({ a: 1, b: 2, c: 3 }) === hash({ c: 3, b: 2, a: 1 })
+```
+
+Circular:
+
+```js
+const foo = {}
+foo.foo = foo
+hash(foo) === hash(foo)
+```
+
+### Function, Class, Set, Map, Buffer...
+
+`stable-hash` guarantees reference consistency (`===`) for objects that the constructor isn't `Object`.
+
+```js
+const foo = () => {}
+hash(foo) === hash(foo)
+hash(foo) !== hash(() => {})
+```
+
+```js
+class Foo {}
+hash(Foo) === hash(Foo)
+hash(Foo) !== hash(class {})
+```
+
+```js
+const foo = new Set([1])
+hash(foo) === hash(foo)
+hash(foo) !== hash(new Set([1]))
+```
+
+## Notes
+
+This function does something similar to `JSON.stringify`, but more than it. It doesn't generate a secure checksum, which usually has a fixed length and is hard to be reversed. With `stable-hash` it's still possible to get the original data. Also, the output might include any charaters, not just alphabets and numbers like other hash algorithms. So:
+
+- Use another encoding layer on top of it if you want to display the output. 
+- Use another crypto layer on top of it if you want to have a secure and fixed length hash.
+
+```js
+import crypto from 'crypto'
+import hash from 'stable-hash'
+
+const weakHash = hash(anyJavaScriptValueHere)
+const encodedHash = Buffer.from(weakHash).toString('base64')
+const safeHash = crypto.createHash('MD5').update(weakHash).digest('hex')
+```
+
+Also, the consistency of this lib is sometimes guaranteed by the singularity of the WeakMap instance. So it might not generate the consistent results when running in different runtimes, e.g. server/client or parent/worker scenarios.
+
+## License
+
+Created by Shu Ding. Released under the MIT License.