Add types for bn.js (#26120)

types/bn.js/bn.js-tests.ts

@@ -0,0 +1,6 @@
+import BN = require('bn.js');
+
+let bn = new BN(42);
+bn = bn.add(bn);
+bn.isZero();
+bn.byteLength;

types/bn.js/index.d.ts

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+// Type definitions for bn.js 4.11
+// Project: https://github.com/indutny/bn.js
+// Definitions by: Leonid Logvinov <https://github.com/LogvinovLeon>
+// Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
+
+/// <reference types="node"/>
+
+type Endianness = 'le' | 'be';
+
+declare class BN {
+    constructor(num: number | string | number[] | Buffer, base?: number, endian?: Endianness);
+    clone(): BN;
+    toString(base?: number, length?: number): string;
+    toNumber(): number;
+    toJSON(): string;
+    toArray(endian?: Endianness, length?: number): number[];
+    toBuffer(endian?: Endianness, length?: number): Buffer;
+    bitLength(): number;
+    zeroBits(): number;
+    byteLength(): number;
+    isNeg(): boolean;
+    isEven(): boolean;
+    isOdd(): boolean;
+    isZero(): boolean;
+    cmp(b: any): number;
+    lt(b: any): boolean;
+    lte(b: any): boolean;
+    gt(b: any): boolean;
+    gte(b: any): boolean;
+    eq(b: any): boolean;
+    isBN(b: any): boolean;
+
+    neg(): BN;
+    abs(): BN;
+    add(b: BN): BN;
+    sub(b: BN): BN;
+    mul(b: BN): BN;
+    sqr(): BN;
+    pow(b: BN): BN;
+    div(b: BN): BN;
+    mod(b: BN): BN;
+    divRound(b: BN): BN;
+
+    or(b: BN): BN;
+    and(b: BN): BN;
+    xor(b: BN): BN;
+    setn(b: number): BN;
+    shln(b: number): BN;
+    shrn(b: number): BN;
+    testn(b: number): boolean;
+    maskn(b: number): BN;
+    bincn(b: number): BN;
+    notn(w: number): BN;
+
+    gcd(b: BN): BN;
+    egcd(b: BN): { a: BN; b: BN; gcd: BN };
+    invm(b: BN): BN;
+}
+
+export = BN;

types/bn.js/tsconfig.json

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+{
+    "compilerOptions": {
+        "module": "commonjs",
+        "lib": ["es6"],
+        "noImplicitAny": true,
+        "noImplicitThis": true,
+        "strictFunctionTypes": true,
+        "strictNullChecks": true,
+        "baseUrl": "../",
+        "typeRoots": ["../"],
+        "types": [],
+        "noEmit": true,
+        "forceConsistentCasingInFileNames": true
+    },
+    "files": ["index.d.ts", "bn.js-tests.ts"]
+}

types/bn.js/tslint.json

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+{ "extends": "dtslint/dt.json" }