init: first

.gitignore

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+# Based on https://raw.githubusercontent.com/github/gitignore/main/Node.gitignore
+
+# Logs
+
+logs
+_.log
+npm-debug.log_
+yarn-debug.log*
+yarn-error.log*
+lerna-debug.log*
+.pnpm-debug.log*
+
+# Diagnostic reports (https://nodejs.org/api/report.html)
+
+report.[0-9]_.[0-9]_.[0-9]_.[0-9]_.json
+
+# Runtime data
+
+pids
+_.pid
+_.seed
+\*.pid.lock
+
+# Directory for instrumented libs generated by jscoverage/JSCover
+
+lib-cov
+
+# Coverage directory used by tools like istanbul
+
+coverage
+\*.lcov
+
+# nyc test coverage
+
+.nyc_output
+
+# Grunt intermediate storage (https://gruntjs.com/creating-plugins#storing-task-files)
+
+.grunt
+
+# Bower dependency directory (https://bower.io/)
+
+bower_components
+
+# node-waf configuration
+
+.lock-wscript
+
+# Compiled binary addons (https://nodejs.org/api/addons.html)
+
+build/Release
+
+# Dependency directories
+
+node_modules/
+jspm_packages/
+
+# Snowpack dependency directory (https://snowpack.dev/)
+
+web_modules/
+
+# TypeScript cache
+
+\*.tsbuildinfo
+
+# Optional npm cache directory
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+.npm
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+# Optional eslint cache
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+.eslintcache
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+# Optional stylelint cache
+
+.stylelintcache
+
+# Microbundle cache
+
+.rpt2_cache/
+.rts2_cache_cjs/
+.rts2_cache_es/
+.rts2_cache_umd/
+
+# Optional REPL history
+
+.node_repl_history
+
+# Output of 'npm pack'
+
+\*.tgz
+
+# Yarn Integrity file
+
+.yarn-integrity
+
+# dotenv environment variable files
+
+.env
+.env.development.local
+.env.test.local
+.env.production.local
+.env.local
+
+# parcel-bundler cache (https://parceljs.org/)
+
+.cache
+.parcel-cache
+
+# Next.js build output
+
+.next
+out
+
+# Nuxt.js build / generate output
+
+.nuxt
+dist
+
+# Gatsby files
+
+.cache/
+
+# Comment in the public line in if your project uses Gatsby and not Next.js
+
+# https://nextjs.org/blog/next-9-1#public-directory-support
+
+# public
+
+# vuepress build output
+
+.vuepress/dist
+
+# vuepress v2.x temp and cache directory
+
+.temp
+.cache
+
+# Docusaurus cache and generated files
+
+.docusaurus
+
+# Serverless directories
+
+.serverless/
+
+# FuseBox cache
+
+.fusebox/
+
+# DynamoDB Local files
+
+.dynamodb/
+
+# TernJS port file
+
+.tern-port
+
+# Stores VSCode versions used for testing VSCode extensions
+
+.vscode-test
+
+# yarn v2
+
+.yarn/cache
+.yarn/unplugged
+.yarn/build-state.yml
+.yarn/install-state.gz
+.pnp.\*
+
+# IntelliJ based IDEs
+.idea
+
+# Finder (MacOS) folder config
+.DS_Store
+

README.md

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+# big-varuint
+
+To install dependencies:
+
+```bash
+bun install
+```
+
+To run:
+
+```bash
+bun run example.ts
+```

example.ts

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+import {
+  U128_MAX_NUMBER,
+  U16_MAX_NUMBER,
+  U32_MAX_NUMBER,
+  U64_MAX_NUMBER,
+  U8_MAX_NUMBER,
+} from "./types";
+import { U128, U16, U32, U64, U8 } from "./uint";
+import { Varuint } from "./varuint";
+
+async function main() {
+  const examples: Varuint[] = [
+    new U8(U8_MAX_NUMBER),
+    new U16(U16_MAX_NUMBER),
+    new U32(U32_MAX_NUMBER),
+    new U64(U64_MAX_NUMBER),
+    new U128(U128_MAX_NUMBER),
+  ];
+
+  // encode
+  for (let i = 0; i < examples.length; i += 1) {
+    console.log(examples[i].toString());
+    console.log(examples[i].toVaruint());
+  }
+
+  // decode then encode
+  for (let i = 0; i < examples.length; i += 1) {
+    console.log(examples[i].toString());
+    if (examples[i] instanceof U8) {
+      const buff = examples[i].toVaruint();
+      console.log(U8.fromVaruint(buff).toString());
+    }
+    if (examples[i] instanceof U16) {
+      const buff = examples[i].toVaruint();
+      console.log(U16.fromVaruint(buff).toString());
+    }
+    if (examples[i] instanceof U32) {
+      const buff = examples[i].toVaruint();
+      console.log(U32.fromVaruint(buff).toString());
+    }
+    if (examples[i] instanceof U64) {
+      const buff = examples[i].toVaruint();
+      console.log(U64.fromVaruint(buff).toString());
+    }
+    if (examples[i] instanceof U128) {
+      const buff = examples[i].toVaruint();
+      console.log(U128.fromVaruint(buff).toString());
+    }
+  }
+}
+
+main();

package.json

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+{
+  "name": "big-varuint",
+  "module": "index.ts",
+  "type": "module",
+  "devDependencies": {
+    "bun-types": "latest"
+  },
+  "peerDependencies": {
+    "typescript": "^5.0.0"
+  }
+}

tsconfig.json

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+{
+  "compilerOptions": {
+    "lib": ["ESNext"],
+    "module": "esnext",
+    "target": "esnext",
+    "moduleResolution": "bundler",
+    "moduleDetection": "force",
+    "allowImportingTsExtensions": true,
+    "noEmit": true,
+    "composite": true,
+    "strict": true,
+    "downlevelIteration": true,
+    "skipLibCheck": true,
+    "jsx": "react-jsx",
+    "allowSyntheticDefaultImports": true,
+    "forceConsistentCasingInFileNames": true,
+    "allowJs": true,
+    "types": [
+      "bun-types" // add Bun global
+    ]
+  }
+}

types.ts

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+export const U8_MAX_NUMBER = 0xffn;
+export const U16_MAX_NUMBER = 0xffffn;
+export const U32_MAX_NUMBER = 0xffff_ffffn;
+export const U64_MAX_NUMBER = 0xffff_ffff_ffff_ffffn;
+export const U128_MAX_NUMBER = 0xffff_ffff_ffff_ffff_ffff_ffff_ffff_ffffn;
+
+export const BUFFER_MAX_LENGTH = 19; // maximum u128 length

uint.ts

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+import {
+  U8_MAX_NUMBER,
+  U32_MAX_NUMBER,
+  U64_MAX_NUMBER,
+  U128_MAX_NUMBER,
+  U16_MAX_NUMBER,
+} from "./types";
+import { Varuint, decodeBigVaruint } from "./varuint";
+
+export class U8 extends Varuint {
+  constructor(n: bigint) {
+    super(n, U8_MAX_NUMBER);
+  }
+
+  static fromString(nStr: string) {
+    return new U8(BigInt(nStr));
+  }
+
+  static fromNumber(nNum: number) {
+    return new U8(BigInt(nNum));
+  }
+
+  static fromVaruint(buff: Buffer){
+    return new U8(decodeBigVaruint(buff))
+  }
+}
+
+export class U16 extends Varuint {
+  constructor(n: bigint) {
+    super(n, U16_MAX_NUMBER);
+  }
+
+  static fromString(nStr: string) {
+    return new U16(BigInt(nStr));
+  }
+
+  static fromNumber(nNum: number) {
+    return new U16(BigInt(nNum));
+  }
+
+  static fromVaruint(buff: Buffer){
+    return new U16(decodeBigVaruint(buff))
+  }
+}
+
+export class U32 extends Varuint {
+  constructor(n: bigint) {
+    super(n, U32_MAX_NUMBER);
+  }
+
+  static fromString(nStr: string) {
+    return new U32(BigInt(nStr));
+  }
+
+  static fromNumber(nNum: number) {
+    return new U32(BigInt(nNum));
+  }
+
+  static fromVaruint(buff: Buffer){
+    return new U32(decodeBigVaruint(buff))
+  }
+}
+
+export class U64 extends Varuint {
+  constructor(n: bigint) {
+    super(n, U64_MAX_NUMBER);
+  }
+
+  static fromString(nStr: string) {
+    return new U64(BigInt(nStr));
+  }
+
+  static fromVaruint(buff: Buffer){
+    return new U64(decodeBigVaruint(buff))
+  }
+}
+
+export class U128 extends Varuint {
+  constructor(n: bigint) {
+    super(n, U128_MAX_NUMBER);
+  }
+
+  static fromString(nStr: string) {
+    return new U128(BigInt(nStr));
+  }
+
+  static fromVaruint(buff: Buffer){
+    return new U128(decodeBigVaruint(buff))
+  }
+}