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Apache License
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To apply the Apache License to your work, attach the following
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# crc32
Standard CRC-32 algorithm implementation in JS (for the browser and nodejs).
Emphasis on correctness, performance, and IE6+ support.
## Installation
With [npm](https://www.npmjs.org/package/crc-32):
```bash
$ npm install crc-32
```
When installed globally, npm installs a script `crc32` that computes the
checksum for a specified file or standard input.
<details>
<summary><b>CDN Availability</b> (click to show)</summary>
| CDN | URL |
|-----------:|:-------------------------------------------|
| `unpkg` | <https://unpkg.com/crc-32/> |
| `jsDelivr` | <https://jsdelivr.com/package/npm/crc-32> |
| `CDNjs` | <https://cdnjs.com/libraries/crc-32> |
</details>
## Integration
Using NodeJS or a bundler:
```js
var CRC32 = require("crc-32");
```
In the browser, the `crc32.js` script can be loaded directly:
```html
<script src="crc32.js"></script>
```
The browser script exposes a variable `CRC32`.
The script will manipulate `module.exports` if available . This is not always
desirable. To prevent the behavior, define `DO_NOT_EXPORT_CRC`.
### CRC32C (Castagnoli)
The module and CDNs also include a parallel script for CRC32C calculations.
Using NodeJS or a bundler:
```js
var CRC32C = require("crc-32/crc32c");
```
In the browser, the `crc32c.js` script can be loaded directly:
```html
<script src="crc32c.js"></script>
```
The browser exposes a variable `CRC32C`.
The script will manipulate `module.exports` if available . This is not always
desirable. To prevent the behavior, define `DO_NOT_EXPORT_CRC`.
## Usage
In all cases, the relevant function takes an argument representing data and an
optional second argument representing the starting "seed" (for rolling CRC).
The return value is a signed 32-bit integer.
- `CRC32.buf(byte array or buffer[, seed])` assumes the argument is a sequence
of 8-bit unsigned integers (nodejs `Buffer`, `Uint8Array` or array of bytes).
- `CRC32.bstr(binary string[, seed])` assumes the argument is a binary string
where byte `i` is the low byte of the UCS-2 char: `str.charCodeAt(i) & 0xFF`
- `CRC32.str(string[, seed])` assumes the argument is a standard JS string and
calculates the hash of the UTF-8 encoding.
For example:
```js
// var CRC32 = require('crc-32'); // uncomment this line if in node
CRC32.str("SheetJS") // -1647298270
CRC32.bstr("SheetJS") // -1647298270
CRC32.buf([ 83, 104, 101, 101, 116, 74, 83 ]) // -1647298270
crc32 = CRC32.buf([83, 104]) // -1826163454 "Sh"
crc32 = CRC32.str("eet", crc32) // 1191034598 "Sheet"
CRC32.bstr("JS", crc32) // -1647298270 "SheetJS"
[CRC32.str("\u2603"), CRC32.str("\u0003")] // [ -1743909036, 1259060791 ]
[CRC32.bstr("\u2603"), CRC32.bstr("\u0003")] // [ 1259060791, 1259060791 ]
[CRC32.buf([0x2603]), CRC32.buf([0x0003])] // [ 1259060791, 1259060791 ]
// var CRC32C = require('crc-32/crc32c'); // uncomment this line if in node
CRC32C.str("SheetJS") // -284764294
CRC32C.bstr("SheetJS") // -284764294
CRC32C.buf([ 83, 104, 101, 101, 116, 74, 83 ]) // -284764294
crc32c = CRC32C.buf([83, 104]) // -297065629 "Sh"
crc32c = CRC32C.str("eet", crc32c) // 1241364256 "Sheet"
CRC32C.bstr("JS", crc32c) // -284764294 "SheetJS"
[CRC32C.str("\u2603"), CRC32C.str("\u0003")] // [ 1253703093, 1093509285 ]
[CRC32C.bstr("\u2603"), CRC32C.bstr("\u0003")] // [ 1093509285, 1093509285 ]
[CRC32C.buf([0x2603]), CRC32C.buf([0x0003])] // [ 1093509285, 1093509285 ]
```
### Best Practices
Even though the initial seed is optional, for performance reasons it is highly
recommended to explicitly pass the default seed 0.
In NodeJS with the native Buffer implementation, it is oftentimes faster to
convert binary strings with `Buffer.from(bstr, "binary")` first:
```js
/* Frequently slower in NodeJS */
crc32 = CRC32.bstr(bstr, 0);
/* Frequently faster in NodeJS */
crc32 = CRC32.buf(Buffer.from(bstr, "binary"), 0);
```
This does not apply to browser `Buffer` shims, and thus is not implemented in
the library directly.
## Testing
`make test` will run the nodejs-based test.
To run the in-browser tests, run a local server and go to the `ctest` directory.
`make ctestserv` will start a python `SimpleHTTPServer` server on port 8000.
To update the browser artifacts, run `make ctest`.
To generate the bits file, use the `crc32` function from python `zlib`:
```python
>>> from zlib import crc32
>>> x="foo bar baz٪☃🍣"
>>> crc32(x)
1531648243
>>> crc32(x+x)
-218791105
>>> crc32(x+x+x)
1834240887
```
The included `crc32.njs` script can process files or standard input:
```bash
$ echo "this is a test" > t.txt
$ bin/crc32.njs t.txt
1912935186
```
For comparison, the included `crc32.py` script uses python `zlib`:
```bash
$ bin/crc32.py t.txt
1912935186
```
On OSX the command `cksum` generates unsigned CRC-32 with Algorithm 3:
```bash
$ cksum -o 3 < IE8.Win7.For.Windows.VMware.zip
1891069052 4161613172
$ crc32 --unsigned ~/Downloads/IE8.Win7.For.Windows.VMware.zip
1891069052
```
## Performance
`make perf` will run algorithmic performance tests (which should justify certain
decisions in the code).
The [`adler-32` project](http://git.io/adler32) has more performance notes
## License
Please consult the attached LICENSE file for details. All rights not explicitly
granted by the Apache 2.0 license are reserved by the Original Author.
## Badges
[![Sauce Test Status](https://saucelabs.com/browser-matrix/crc32.svg)](https://saucelabs.com/u/crc32)
[![Build Status](https://travis-ci.org/SheetJS/js-crc32.svg?branch=master)](https://travis-ci.org/SheetJS/js-crc32)
[![Coverage Status](http://img.shields.io/coveralls/SheetJS/js-crc32/master.svg)](https://coveralls.io/r/SheetJS/js-crc32?branch=master)
[![Dependencies Status](https://david-dm.org/sheetjs/js-crc32/status.svg)](https://david-dm.org/sheetjs/js-crc32)
[![NPM Downloads](https://img.shields.io/npm/dt/crc-32.svg)](https://npmjs.org/package/crc-32)
[![ghit.me](https://ghit.me/badge.svg?repo=sheetjs/js-xlsx)](https://ghit.me/repo/sheetjs/js-xlsx)
[![Analytics](https://ga-beacon.appspot.com/UA-36810333-1/SheetJS/js-crc32?pixel)](https://github.com/SheetJS/js-crc32)

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#!/usr/bin/env node
/* crc32.js (C) 2014-present SheetJS -- http://sheetjs.com */
/* eslint-env node */
/* vim: set ts=2 ft=javascript: */
/*jshint node:true */
var X/*:CRC32Module*/;
try { X = require('../'); } catch(e) { X = require('crc-32'); }
function help()/*:number*/ {
[
"usage: crc32 [options] [filename]",
"",
"Options:",
" -h, --help output usage information",
" -V, --version output the version number",
" -S, --seed=<n> use integer seed as starting value (rolling CRC)",
" -H, --hex-seed=<h> use hex seed as starting value (rolling CRC)",
" -d, --signed print result with format `%d` (default)",
" -u, --unsigned print result with format `%u`",
" -x, --hex print result with format `%0.8x`",
" -X, --HEX print result with format `%0.8X`",
" -c, --crc32c use CRC32C (Castagnoli)",
" -F, --format=<s> use specified printf format",
"",
"Set filename = '-' or pipe data into crc32 to read from stdin",
"Default output mode is signed (-d)",
""
].forEach(function(l) { console.log(l); });
return 0;
}
function version()/*:number*/ { console.log(X.version); return 0; }
var fs = require('fs');
try { require('exit-on-epipe'); } catch(e) {}
function die(msg/*:string*/, ec/*:?number*/)/*:void*/ { console.error(msg); process.exit(ec || 0); }
var args/*:Array<string>*/ = process.argv.slice(2);
var filename/*:string*/ = "";
var fmt/*:string*/ = "";
var seed = 0, r = 10;
for(var i = 0; i < args.length; ++i) {
var arg = args[i];
if(arg.charCodeAt(0) != 45) { if(filename === "") filename = arg; continue; }
var m = arg.indexOf("=") == -1 ? arg : arg.substr(0, arg.indexOf("="));
switch(m) {
case "-": filename = "-"; break;
case "--help": case "-h": process.exit(help()); break;
case "--version": case "-V": process.exit(version()); break;
case "--crc32c": case "-c": try { X = require('../crc32c'); } catch(e) { X = require('crc-32/crc32c'); } break;
case "--signed": case "-d": fmt = "%d"; break;
case "--unsigned": case "-u": fmt = "%u"; break;
case "--hex": case "-x": fmt = "%0.8x"; break;
case "--HEX": case "-X": fmt = "%0.8X"; break;
case "--format": case "-F":
try {
require("printj");
fmt = ((m!=arg) ? arg.substr(m.length+1) : args[++i])||"";
} catch(e) {
console.error("The `crc-32` module removed the `printj` dependency for formatting");
console.error("Use the `crc32-cli` module instead:");
console.error(" $ npx crc32-cli [options] [filename]");
} break;
case "--hex-seed": case "-H": r = 16;
/* falls through */
case "--seed": case "-S":
seed=parseInt((m!=arg) ? arg.substr(m.length+1) : args[++i], r)||0; break;
default: die("crc32: unrecognized option `" + arg + "'", 22);
}
}
if(!process.stdin.isTTY) filename = filename || "-";
if(filename.length===0) die("crc32: must specify a filename ('-' for stdin)",1);
var crc32 = seed;
// $FlowIgnore -- Writable is callable but type sig disagrees
var writable = require('stream').Writable();
writable._write = function(chunk, e, cb) { crc32 = X.buf(chunk, crc32); cb(); };
writable._writev = function(chunks, cb) {
chunks.forEach(function(c) { crc32 = X.buf(c.chunk, crc32);});
cb();
};
writable.on('finish', function() {
if(fmt === "") console.log(crc32);
else try { console.log(require("printj").sprintf(fmt, crc32)); } catch(e) {
switch(fmt) {
case "%d": console.log(crc32); break;
case "%u": console.log(crc32 >>> 0); break;
case "%0.8x": console.log((crc32 >>> 0).toString(16).padStart(8, "0").toLowerCase()); break;
case "%0.8X": console.log((crc32 >>> 0).toString(16).padStart(8, "0").toUpperCase()); break;
}
}
});
if(filename === "-") process.stdin.pipe(writable);
else if(fs.existsSync(filename)) fs.createReadStream(filename).pipe(writable);
else die("crc32: " + filename + ": No such file or directory", 2);

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/*! crc32.js (C) 2014-present SheetJS -- http://sheetjs.com */
/* vim: set ts=2: */
/*exported CRC32 */
var CRC32;
(function (factory) {
/*jshint ignore:start */
/*eslint-disable */
if(typeof DO_NOT_EXPORT_CRC === 'undefined') {
if('object' === typeof exports) {
factory(exports);
} else if ('function' === typeof define && define.amd) {
define(function () {
var module = {};
factory(module);
return module;
});
} else {
factory(CRC32 = {});
}
} else {
factory(CRC32 = {});
}
/*eslint-enable */
/*jshint ignore:end */
}(function(CRC32) {
CRC32.version = '1.2.2';
/*global Int32Array */
function signed_crc_table() {
var c = 0, table = new Array(256);
for(var n =0; n != 256; ++n){
c = n;
c = ((c&1) ? (-306674912 ^ (c >>> 1)) : (c >>> 1));
c = ((c&1) ? (-306674912 ^ (c >>> 1)) : (c >>> 1));
c = ((c&1) ? (-306674912 ^ (c >>> 1)) : (c >>> 1));
c = ((c&1) ? (-306674912 ^ (c >>> 1)) : (c >>> 1));
c = ((c&1) ? (-306674912 ^ (c >>> 1)) : (c >>> 1));
c = ((c&1) ? (-306674912 ^ (c >>> 1)) : (c >>> 1));
c = ((c&1) ? (-306674912 ^ (c >>> 1)) : (c >>> 1));
c = ((c&1) ? (-306674912 ^ (c >>> 1)) : (c >>> 1));
table[n] = c;
}
return typeof Int32Array !== 'undefined' ? new Int32Array(table) : table;
}
var T0 = signed_crc_table();
function slice_by_16_tables(T) {
var c = 0, v = 0, n = 0, table = typeof Int32Array !== 'undefined' ? new Int32Array(4096) : new Array(4096) ;
for(n = 0; n != 256; ++n) table[n] = T[n];
for(n = 0; n != 256; ++n) {
v = T[n];
for(c = 256 + n; c < 4096; c += 256) v = table[c] = (v >>> 8) ^ T[v & 0xFF];
}
var out = [];
for(n = 1; n != 16; ++n) out[n - 1] = typeof Int32Array !== 'undefined' ? table.subarray(n * 256, n * 256 + 256) : table.slice(n * 256, n * 256 + 256);
return out;
}
var TT = slice_by_16_tables(T0);
var T1 = TT[0], T2 = TT[1], T3 = TT[2], T4 = TT[3], T5 = TT[4];
var T6 = TT[5], T7 = TT[6], T8 = TT[7], T9 = TT[8], Ta = TT[9];
var Tb = TT[10], Tc = TT[11], Td = TT[12], Te = TT[13], Tf = TT[14];
function crc32_bstr(bstr, seed) {
var C = seed ^ -1;
for(var i = 0, L = bstr.length; i < L;) C = (C>>>8) ^ T0[(C^bstr.charCodeAt(i++))&0xFF];
return ~C;
}
function crc32_buf(B, seed) {
var C = seed ^ -1, L = B.length - 15, i = 0;
for(; i < L;) C =
Tf[B[i++] ^ (C & 255)] ^
Te[B[i++] ^ ((C >> 8) & 255)] ^
Td[B[i++] ^ ((C >> 16) & 255)] ^
Tc[B[i++] ^ (C >>> 24)] ^
Tb[B[i++]] ^ Ta[B[i++]] ^ T9[B[i++]] ^ T8[B[i++]] ^
T7[B[i++]] ^ T6[B[i++]] ^ T5[B[i++]] ^ T4[B[i++]] ^
T3[B[i++]] ^ T2[B[i++]] ^ T1[B[i++]] ^ T0[B[i++]];
L += 15;
while(i < L) C = (C>>>8) ^ T0[(C^B[i++])&0xFF];
return ~C;
}
function crc32_str(str, seed) {
var C = seed ^ -1;
for(var i = 0, L = str.length, c = 0, d = 0; i < L;) {
c = str.charCodeAt(i++);
if(c < 0x80) {
C = (C>>>8) ^ T0[(C^c)&0xFF];
} else if(c < 0x800) {
C = (C>>>8) ^ T0[(C ^ (192|((c>>6)&31)))&0xFF];
C = (C>>>8) ^ T0[(C ^ (128|(c&63)))&0xFF];
} else if(c >= 0xD800 && c < 0xE000) {
c = (c&1023)+64; d = str.charCodeAt(i++)&1023;
C = (C>>>8) ^ T0[(C ^ (240|((c>>8)&7)))&0xFF];
C = (C>>>8) ^ T0[(C ^ (128|((c>>2)&63)))&0xFF];
C = (C>>>8) ^ T0[(C ^ (128|((d>>6)&15)|((c&3)<<4)))&0xFF];
C = (C>>>8) ^ T0[(C ^ (128|(d&63)))&0xFF];
} else {
C = (C>>>8) ^ T0[(C ^ (224|((c>>12)&15)))&0xFF];
C = (C>>>8) ^ T0[(C ^ (128|((c>>6)&63)))&0xFF];
C = (C>>>8) ^ T0[(C ^ (128|(c&63)))&0xFF];
}
}
return ~C;
}
CRC32.table = T0;
// $FlowIgnore
CRC32.bstr = crc32_bstr;
// $FlowIgnore
CRC32.buf = crc32_buf;
// $FlowIgnore
CRC32.str = crc32_str;
}));

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/*! crc32.js (C) 2014-present SheetJS -- http://sheetjs.com */
/* vim: set ts=2: */
/*exported CRC32C */
var CRC32C;
(function (factory) {
/*jshint ignore:start */
/*eslint-disable */
if(typeof DO_NOT_EXPORT_CRC === 'undefined') {
if('object' === typeof exports) {
factory(exports);
} else if ('function' === typeof define && define.amd) {
define(function () {
var module = {};
factory(module);
return module;
});
} else {
factory(CRC32C = {});
}
} else {
factory(CRC32C = {});
}
/*eslint-enable */
/*jshint ignore:end */
}(function(CRC32C) {
CRC32C.version = '1.2.2';
/*global Int32Array */
function signed_crc_table() {
var c = 0, table = new Array(256);
for(var n =0; n != 256; ++n){
c = n;
c = ((c&1) ? (-2097792136 ^ (c >>> 1)) : (c >>> 1));
c = ((c&1) ? (-2097792136 ^ (c >>> 1)) : (c >>> 1));
c = ((c&1) ? (-2097792136 ^ (c >>> 1)) : (c >>> 1));
c = ((c&1) ? (-2097792136 ^ (c >>> 1)) : (c >>> 1));
c = ((c&1) ? (-2097792136 ^ (c >>> 1)) : (c >>> 1));
c = ((c&1) ? (-2097792136 ^ (c >>> 1)) : (c >>> 1));
c = ((c&1) ? (-2097792136 ^ (c >>> 1)) : (c >>> 1));
c = ((c&1) ? (-2097792136 ^ (c >>> 1)) : (c >>> 1));
table[n] = c;
}
return typeof Int32Array !== 'undefined' ? new Int32Array(table) : table;
}
var T0 = signed_crc_table();
function slice_by_16_tables(T) {
var c = 0, v = 0, n = 0, table = typeof Int32Array !== 'undefined' ? new Int32Array(4096) : new Array(4096) ;
for(n = 0; n != 256; ++n) table[n] = T[n];
for(n = 0; n != 256; ++n) {
v = T[n];
for(c = 256 + n; c < 4096; c += 256) v = table[c] = (v >>> 8) ^ T[v & 0xFF];
}
var out = [];
for(n = 1; n != 16; ++n) out[n - 1] = typeof Int32Array !== 'undefined' ? table.subarray(n * 256, n * 256 + 256) : table.slice(n * 256, n * 256 + 256);
return out;
}
var TT = slice_by_16_tables(T0);
var T1 = TT[0], T2 = TT[1], T3 = TT[2], T4 = TT[3], T5 = TT[4];
var T6 = TT[5], T7 = TT[6], T8 = TT[7], T9 = TT[8], Ta = TT[9];
var Tb = TT[10], Tc = TT[11], Td = TT[12], Te = TT[13], Tf = TT[14];
function crc32_bstr(bstr, seed) {
var C = seed ^ -1;
for(var i = 0, L = bstr.length; i < L;) C = (C>>>8) ^ T0[(C^bstr.charCodeAt(i++))&0xFF];
return ~C;
}
function crc32_buf(B, seed) {
var C = seed ^ -1, L = B.length - 15, i = 0;
for(; i < L;) C =
Tf[B[i++] ^ (C & 255)] ^
Te[B[i++] ^ ((C >> 8) & 255)] ^
Td[B[i++] ^ ((C >> 16) & 255)] ^
Tc[B[i++] ^ (C >>> 24)] ^
Tb[B[i++]] ^ Ta[B[i++]] ^ T9[B[i++]] ^ T8[B[i++]] ^
T7[B[i++]] ^ T6[B[i++]] ^ T5[B[i++]] ^ T4[B[i++]] ^
T3[B[i++]] ^ T2[B[i++]] ^ T1[B[i++]] ^ T0[B[i++]];
L += 15;
while(i < L) C = (C>>>8) ^ T0[(C^B[i++])&0xFF];
return ~C;
}
function crc32_str(str, seed) {
var C = seed ^ -1;
for(var i = 0, L = str.length, c = 0, d = 0; i < L;) {
c = str.charCodeAt(i++);
if(c < 0x80) {
C = (C>>>8) ^ T0[(C^c)&0xFF];
} else if(c < 0x800) {
C = (C>>>8) ^ T0[(C ^ (192|((c>>6)&31)))&0xFF];
C = (C>>>8) ^ T0[(C ^ (128|(c&63)))&0xFF];
} else if(c >= 0xD800 && c < 0xE000) {
c = (c&1023)+64; d = str.charCodeAt(i++)&1023;
C = (C>>>8) ^ T0[(C ^ (240|((c>>8)&7)))&0xFF];
C = (C>>>8) ^ T0[(C ^ (128|((c>>2)&63)))&0xFF];
C = (C>>>8) ^ T0[(C ^ (128|((d>>6)&15)|((c&3)<<4)))&0xFF];
C = (C>>>8) ^ T0[(C ^ (128|(d&63)))&0xFF];
} else {
C = (C>>>8) ^ T0[(C ^ (224|((c>>12)&15)))&0xFF];
C = (C>>>8) ^ T0[(C ^ (128|((c>>6)&63)))&0xFF];
C = (C>>>8) ^ T0[(C ^ (128|(c&63)))&0xFF];
}
}
return ~C;
}
CRC32C.table = T0;
// $FlowIgnore
CRC32C.bstr = crc32_bstr;
// $FlowIgnore
CRC32C.buf = crc32_buf;
// $FlowIgnore
CRC32C.str = crc32_str;
}));

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node_modules/crc-32/package.json generated vendored Normal file
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{
"name": "crc-32",
"version": "1.2.2",
"author": "sheetjs",
"description": "Pure-JS CRC-32",
"keywords": [ "crc", "crc32", "checksum" ],
"bin": {
"crc32": "bin/crc32.njs"
},
"main": "crc32.js",
"types": "types/index.d.ts",
"typesVersions": { "*": { "*": ["types/index.d.ts" ] } },
"dependencies": {
},
"devDependencies": {
"printj": "~1.3.1",
"exit-on-epipe": "~1.0.1",
"mocha": "~2.5.3",
"blanket": "~1.2.3",
"codepage": "~1.10.0",
"@sheetjs/uglify-js": "~2.7.3",
"@types/node": "^8.0.7",
"dtslint": "^0.1.2",
"typescript": "2.2.0"
},
"repository": { "type": "git", "url": "git://github.com/SheetJS/js-crc32.git" },
"scripts": {
"test": "make test",
"build": "make",
"lint": "make fullint",
"dtslint": "dtslint types"
},
"config": {
"blanket": {
"pattern": "crc32.js"
}
},
"homepage": "https://sheetjs.com/",
"files": ["crc32.js", "crc32c.js", "bin/crc32.njs", "LICENSE", "README.md", "types/index.d.ts", "types/*.json"],
"bugs": { "url": "https://github.com/SheetJS/js-crc32/issues" },
"license": "Apache-2.0",
"engines": { "node": ">=0.8" }
}

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node_modules/crc-32/types/index.d.ts generated vendored Normal file
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/* crc32.js (C) 2014-present SheetJS -- http://sheetjs.com */
// TypeScript Version: 2.2
/** Version string */
export const version: string;
/** Process a node buffer or byte array */
export function buf(data: number[] | Uint8Array, seed?: number): number;
/** Process a binary string */
export function bstr(data: string, seed?: number): number;
/** Process a JS string based on the UTF8 encoding */
export function str(data: string, seed?: number): number;

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node_modules/crc-32/types/tsconfig.json generated vendored Normal file
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{
"compilerOptions": {
"module": "commonjs",
"lib": [ "es5" ],
"noImplicitAny": true,
"noImplicitThis": true,
"strictNullChecks": false,
"baseUrl": ".",
"paths": { "crc-32": ["."] },
"types": [],
"noEmit": true,
"forceConsistentCasingInFileNames": true
}
}

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node_modules/crc-32/types/tslint.json generated vendored Normal file
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{
"extends": "dtslint/dtslint.json",
"rules": {
"whitespace": false,
"no-sparse-arrays": false,
"only-arrow-functions": false,
"no-consecutive-blank-lines": false,
"prefer-conditional-expression": false,
"one-variable-per-declaration": false
}
}