tools: update eslint

This updates eslint from v6.0.0-alpha.2 to v6.0.0-rc.0.

This also removes eslint-disable comments about `bigint` typeof
checks. Those would otherwise have caused linting errors now that
`bigint` is accepted as valid entry.

benchmark/process/bench-hrtime.js

@@ -37,6 +37,5 @@ function main({ n, type }) {
       break;
   }
 
-  // eslint-disable-next-line valid-typeof
   assert.ok(Array.isArray(noDead) || typeof noDead === 'bigint');
 }

lib/internal/buffer.js

@@ -43,7 +43,6 @@ function checkBounds(buf, offset, byteLength) {
 
 function checkInt(value, min, max, buf, offset, byteLength) {
   if (value > max || value < min) {
-    // eslint-disable-next-line valid-typeof
     const n = typeof min === 'bigint' ? 'n' : '';
     let range;
     if (byteLength > 3) {

lib/internal/errors.js

@@ -1044,7 +1044,6 @@ E('ERR_OUT_OF_RANGE',
     let received;
     if (Number.isInteger(input) && Math.abs(input) > 2 ** 32) {
       received = addNumericalSeparator(String(input));
-    // eslint-disable-next-line valid-typeof
     } else if (typeof input === 'bigint') {
       received = String(input);
       if (input > 2n ** 32n || input < -(2n ** 32n)) {

lib/internal/util/inspect.js

@@ -1112,7 +1112,6 @@ function formatPrimitive(fn, value, ctx) {
   }
   if (typeof value === 'number')
     return formatNumber(fn, value);
-  // eslint-disable-next-line valid-typeof
   if (typeof value === 'bigint')
     return formatBigInt(fn, value);
   if (typeof value === 'boolean')
@@ -1575,7 +1574,6 @@ function formatWithOptions(inspectOptions, ...args) {
               const tempArg = args[++a];
               if (typeof tempArg === 'number') {
                 tempStr = formatNumber(stylizeNoColor, tempArg);
-              // eslint-disable-next-line valid-typeof
               } else if (typeof tempArg === 'bigint') {
                 tempStr = `${tempArg}n`;
               } else {
@@ -1607,7 +1605,6 @@ function formatWithOptions(inspectOptions, ...args) {
               break;
             case 100: // 'd'
               const tempNum = args[++a];
-              // eslint-disable-next-line valid-typeof
               if (typeof tempNum === 'bigint') {
                 tempStr = `${tempNum}n`;
               } else if (typeof tempNum === 'symbol') {
@@ -1631,7 +1628,6 @@ function formatWithOptions(inspectOptions, ...args) {
             }
             case 105: // 'i'
               const tempInteger = args[++a];
-              // eslint-disable-next-line valid-typeof
               if (typeof tempInteger === 'bigint') {
                 tempStr = `${tempInteger}n`;
               } else if (typeof tempInteger === 'symbol') {

test/common/index.js

@@ -239,9 +239,6 @@ const pwdCommand = isWindows ?
 
 
 function platformTimeout(ms) {
-  // ESLint will not support 'bigint' in valid-typeof until it reaches stage 4.
-  // See https://github.com/eslint/eslint/pull/9636.
-  // eslint-disable-next-line valid-typeof
   const multipliers = typeof ms === 'bigint' ?
     { two: 2n, four: 4n, seven: 7n } : { two: 2, four: 4, seven: 7 };