Complete Typechain course

docs/typescript/typechain/.gitignore

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+node_modules
+dist

docs/typescript/typechain/README.md

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+# typechain
+
+Learning Typescript by making a Blockchain with it

docs/typescript/typechain/package.json

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+{
+  "name": "typechain",
+  "version": "1.0.0",
+  "description": "Learning Typescript by making a Blockchain with it",
+  "main": "index.js",
+  "license": "MIT",
+  "scripts": {
+    "start": "tsc-watch --onSuccess \"node dist/index.js\""
+  },
+  "devDependencies": {
+    "tsc-watch": "^4.2.8"
+  },
+  "dependencies": {
+    "crypto-js": "^4.0.0",
+    "typescript": "^3.9.5"
+  }
+}

docs/typescript/typechain/src/index.ts

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+import * as CryptoJS from 'crypto-js';
+
+class Block {
+  static calculateBlockHash = (
+    index: number,
+    previousHash: string,
+    timestamp: number,
+    data: string
+  ): string =>
+    CryptoJS.SHA256(index + previousHash + timestamp + data).toString();
+
+  static validateStructure = (aBlock: Block): boolean =>
+    typeof aBlock.index === 'number' &&
+    typeof aBlock.hash === 'string' &&
+    typeof aBlock.previousHash === 'string' &&
+    typeof aBlock.timestamp === 'number' &&
+    typeof aBlock.data === 'string';
+
+  public index: number;
+  public hash: string;
+  public previousHash: string;
+  public data: string;
+  public timestamp: number;
+
+  constructor(
+    index: number,
+    hash: string,
+    previousHash: string,
+    data: string,
+    timestamp: number
+  ) {
+    this.index = index;
+    this.hash = hash;
+    this.previousHash = previousHash;
+    this.data = data;
+    this.timestamp = timestamp;
+  }
+}
+
+const genesisBlock: Block = new Block(0, '2020202020202', '', 'Hello', 123456);
+
+let blockchain: Block[] = [genesisBlock];
+
+const getBlockchain = (): Block[] => blockchain;
+
+const getLatestBlock = (): Block => blockchain[blockchain.length - 1];
+
+const getNewTimeStamp = (): number => Math.round(new Date().getTime() / 1000);
+
+const createNewBlock = (data: string): Block => {
+  const previousBlock: Block = getLatestBlock();
+  const newIndex: number = previousBlock.index + 1;
+  const newTimestamp: number = getNewTimeStamp();
+  const newHash: string = Block.calculateBlockHash(
+    newIndex,
+    previousBlock.hash,
+    newTimestamp,
+    data
+  );
+  const newBlock: Block = new Block(
+    newIndex,
+    newHash,
+    previousBlock.hash,
+    data,
+    newTimestamp
+  );
+  addBlock(newBlock);
+  return newBlock;
+};
+
+const getHashforBlock = (aBlock: Block): string =>
+  Block.calculateBlockHash(
+    aBlock.index,
+    aBlock.previousHash,
+    aBlock.timestamp,
+    aBlock.data
+  );
+
+const isBlockValid = (candidateBlock: Block, previousBlock: Block): boolean => {
+  if (!Block.validateStructure(candidateBlock)) {
+    return false;
+  } else if (previousBlock.index + 1 !== candidateBlock.index) {
+    return false;
+  } else if (previousBlock.hash !== candidateBlock.previousHash) {
+    return false;
+  } else if (getHashforBlock(candidateBlock) !== candidateBlock.hash) {
+    return false;
+  } else {
+    return true;
+  }
+};
+
+const addBlock = (candidateBlock: Block): void => {
+  if (isBlockValid(candidateBlock, getLatestBlock())) {
+    blockchain.push(candidateBlock);
+  }
+};
+
+createNewBlock('second block');
+createNewBlock('third block');
+createNewBlock('forth block');
+
+console.log(blockchain);
+
+export {};

docs/typescript/typechain/tsconfig.json

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+{
+  "compilerOptions": {
+    "module": "commonjs",
+    "target": "ES2015",
+    "sourceMap": true,
+    "outDir": "dist"
+  },
+  "include": ["src/**/*"],
+  "exclude": ["node_modules"]
+}

docs/typescript/typechain/yarn.lock

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+# THIS IS AN AUTOGENERATED FILE. DO NOT EDIT THIS FILE DIRECTLY.
+# yarn lockfile v1
+
+
+ansi-regex@^3.0.0:
+  version "3.0.0"
+  resolved "https://registry.yarnpkg.com/ansi-regex/-/ansi-regex-3.0.0.tgz#ed0317c322064f79466c02966bddb605ab37d998"
+  integrity sha1-7QMXwyIGT3lGbAKWa922Bas32Zg=
+
+cross-spawn@^5.1.0:
+  version "5.1.0"
+  resolved "https://registry.yarnpkg.com/cross-spawn/-/cross-spawn-5.1.0.tgz#e8bd0efee58fcff6f8f94510a0a554bbfa235449"
+  integrity sha1-6L0O/uWPz/b4+UUQoKVUu/ojVEk=
+  dependencies:
+    lru-cache "^4.0.1"
+    shebang-command "^1.2.0"
+    which "^1.2.9"
+
+crypto-js@^4.0.0:
+  version "4.0.0"
+  resolved "https://registry.yarnpkg.com/crypto-js/-/crypto-js-4.0.0.tgz#2904ab2677a9d042856a2ea2ef80de92e4a36dcc"
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+
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+  resolved "https://registry.yarnpkg.com/duplexer/-/duplexer-0.1.1.tgz#ace6ff808c1ce66b57d1ebf97977acb02334cfc1"
+  integrity sha1-rOb/gIwc5mtX0ev5eXessCM0z8E=
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+  resolved "https://registry.yarnpkg.com/event-stream/-/event-stream-3.3.4.tgz#4ab4c9a0f5a54db9338b4c34d86bfce8f4b35571"
+  integrity sha1-SrTJoPWlTbkzi0w02Gv86PSzVXE=
+  dependencies:
+    duplexer "~0.1.1"
+    from "~0"
+    map-stream "~0.1.0"
+    pause-stream "0.0.11"
+    split "0.3"
+    stream-combiner "~0.0.4"
+    through "~2.3.1"
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+  resolved "https://registry.yarnpkg.com/from/-/from-0.1.7.tgz#83c60afc58b9c56997007ed1a768b3ab303a44fe"
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+  version "2.0.0"
+  resolved "https://registry.yarnpkg.com/isexe/-/isexe-2.0.0.tgz#e8fbf374dc556ff8947a10dcb0572d633f2cfa10"
+  integrity sha1-6PvzdNxVb/iUehDcsFctYz8s+hA=
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+  version "4.1.5"
+  resolved "https://registry.yarnpkg.com/lru-cache/-/lru-cache-4.1.5.tgz#8bbe50ea85bed59bc9e33dcab8235ee9bcf443cd"
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+  dependencies:
+    pseudomap "^1.0.2"
+    yallist "^2.1.2"
+
+map-stream@~0.1.0:
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+  resolved "https://registry.yarnpkg.com/map-stream/-/map-stream-0.1.0.tgz#e56aa94c4c8055a16404a0674b78f215f7c8e194"
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+
+node-cleanup@^2.1.2:
+  version "2.1.2"
+  resolved "https://registry.yarnpkg.com/node-cleanup/-/node-cleanup-2.1.2.tgz#7ac19abd297e09a7f72a71545d951b517e4dde2c"
+  integrity sha1-esGavSl+Caf3KnFUXZUbUX5N3iw=
+
+[email protected]:
+  version "0.0.11"
+  resolved "https://registry.yarnpkg.com/pause-stream/-/pause-stream-0.0.11.tgz#fe5a34b0cbce12b5aa6a2b403ee2e73b602f1445"
+  integrity sha1-/lo0sMvOErWqaitAPuLnO2AvFEU=
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+
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+  dependencies:
+    event-stream "=3.3.4"
+
+pseudomap@^1.0.2:
+  version "1.0.2"
+  resolved "https://registry.yarnpkg.com/pseudomap/-/pseudomap-1.0.2.tgz#f052a28da70e618917ef0a8ac34c1ae5a68286b3"
+  integrity sha1-8FKijacOYYkX7wqKw0wa5aaChrM=
+
+shebang-command@^1.2.0:
+  version "1.2.0"
+  resolved "https://registry.yarnpkg.com/shebang-command/-/shebang-command-1.2.0.tgz#44aac65b695b03398968c39f363fee5deafdf1ea"
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+  dependencies:
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+
+shebang-regex@^1.0.0:
+  version "1.0.0"
+  resolved "https://registry.yarnpkg.com/shebang-regex/-/shebang-regex-1.0.0.tgz#da42f49740c0b42db2ca9728571cb190c98efea3"
+  integrity sha1-2kL0l0DAtC2yypcoVxyxkMmO/qM=
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+[email protected]:
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+  resolved "https://registry.yarnpkg.com/strip-ansi/-/strip-ansi-4.0.0.tgz#a8479022eb1ac368a871389b635262c505ee368f"
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+
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+  resolved "https://registry.yarnpkg.com/through/-/through-2.3.8.tgz#0dd4c9ffaabc357960b1b724115d7e0e86a2e1f5"
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+  dependencies:
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+    node-cleanup "^2.1.2"
+    ps-tree "^1.2.0"
+    string-argv "^0.1.1"
+    strip-ansi "^4.0.0"
+
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