fix: vendor varint for pure ESM

Author: mikeal

package.json

@@ -6,6 +6,7 @@
   "type": "module",
   "scripts": {
     "build": "npm_config_yes=true npx ipjs@latest build --tests",
+    "build:vendor": "npx brrp -x varint > vendor/varint.js",
     "publish": "npm_config_yes=true npx ipjs@latest publish",
     "lint": "standard",
     "test:cjs": "npm run build && mocha dist/cjs/node-test/test-*.js && npm run test:cjs:browser",
@@ -71,8 +72,7 @@
   "dependencies": {
     "base-x": "^3.0.8",
     "buffer": "^5.6.0",
-    "cids": "^1.0.0",
-    "varint": "^5.0.0"
+    "cids": "^1.0.0"
   },
   "directories": {
     "test": "test"

src/varint.js

@@ -1,4 +1,4 @@
-import varint from 'varint'
+import varint from '../vendor/varint.js'
 
 /**
  * @param {Uint8Array} data

vendor/varint.js

@@ -0,0 +1,91 @@
+var encode_1 = encode;
+
+var MSB = 0x80
+  , REST = 0x7F
+  , MSBALL = ~REST
+  , INT = Math.pow(2, 31);
+
+function encode(num, out, offset) {
+  out = out || [];
+  offset = offset || 0;
+  var oldOffset = offset;
+
+  while(num >= INT) {
+    out[offset++] = (num & 0xFF) | MSB;
+    num /= 128;
+  }
+  while(num & MSBALL) {
+    out[offset++] = (num & 0xFF) | MSB;
+    num >>>= 7;
+  }
+  out[offset] = num | 0;
+  
+  encode.bytes = offset - oldOffset + 1;
+  
+  return out
+}
+
+var decode = read;
+
+var MSB$1 = 0x80
+  , REST$1 = 0x7F;
+
+function read(buf, offset) {
+  var res    = 0
+    , offset = offset || 0
+    , shift  = 0
+    , counter = offset
+    , b
+    , l = buf.length;
+
+  do {
+    if (counter >= l) {
+      read.bytes = 0;
+      throw new RangeError('Could not decode varint')
+    }
+    b = buf[counter++];
+    res += shift < 28
+      ? (b & REST$1) << shift
+      : (b & REST$1) * Math.pow(2, shift);
+    shift += 7;
+  } while (b >= MSB$1)
+
+  read.bytes = counter - offset;
+
+  return res
+}
+
+var N1 = Math.pow(2,  7);
+var N2 = Math.pow(2, 14);
+var N3 = Math.pow(2, 21);
+var N4 = Math.pow(2, 28);
+var N5 = Math.pow(2, 35);
+var N6 = Math.pow(2, 42);
+var N7 = Math.pow(2, 49);
+var N8 = Math.pow(2, 56);
+var N9 = Math.pow(2, 63);
+
+var length = function (value) {
+  return (
+    value < N1 ? 1
+  : value < N2 ? 2
+  : value < N3 ? 3
+  : value < N4 ? 4
+  : value < N5 ? 5
+  : value < N6 ? 6
+  : value < N7 ? 7
+  : value < N8 ? 8
+  : value < N9 ? 9
+  :              10
+  )
+};
+
+var varint = {
+    encode: encode_1
+  , decode: decode
+  , encodingLength: length
+};
+
+var _brrp_varint = varint;
+
+export default _brrp_varint;