diff --git a/.eslintrc.js b/.eslintrc.js
index 4c4b31c736..b4d34c088e 100644
--- a/.eslintrc.js
+++ b/.eslintrc.js
@@ -14,6 +14,44 @@ module.exports = {
     {
       files: ['*.test.ts', '*.test.js'],
       extends: ['@metamask/eslint-config-jest'],
+      rules: {
+        'jsdoc/check-access': 'off',
+        'jsdoc/check-alignment': 'off',
+        'jsdoc/check-line-alignment': 'off',
+        'jsdoc/check-param-names': 'off',
+        'jsdoc/check-property-names': 'off',
+        'jsdoc/check-tag-names': 'off',
+        'jsdoc/check-types': 'off',
+        'jsdoc/check-values': 'off',
+        'jsdoc/empty-tags': 'off',
+        'jsdoc/implements-on-classes': 'off',
+        'jsdoc/match-description': 'off',
+        'jsdoc/multiline-blocks': 'off',
+        'jsdoc/newline-after-description': 'off',
+        'jsdoc/no-bad-blocks': 'off',
+        'jsdoc/no-defaults': 'off',
+        'jsdoc/no-multi-asterisks': 'off',
+        'jsdoc/require-asterisk-prefix': 'off',
+        'jsdoc/require-description': 'off',
+        'jsdoc/require-hyphen-before-param-description': 'off',
+        'jsdoc/require-jsdoc': 'off',
+        'jsdoc/require-param-name': 'off',
+        'jsdoc/require-param': 'off',
+        'jsdoc/require-param-description': 'off',
+        'jsdoc/require-param-type': 'off',
+        'jsdoc/require-property': 'off',
+        'jsdoc/require-property-description': 'off',
+        'jsdoc/require-property-name': 'off',
+        'jsdoc/require-property-type': 'off',
+        'jsdoc/require-returns': 'off',
+        'jsdoc/require-returns-check': 'off',
+        'jsdoc/require-returns-description': 'off',
+        'jsdoc/require-returns-type': 'off',
+        'jsdoc/require-yields': 'off',
+        'jsdoc/require-yields-check': 'off',
+        'jsdoc/tag-lines': 'off',
+        'jsdoc/valid-types': 'off',
+      },
     },
     {
       files: ['*.js'],
diff --git a/src/gas/fetchFeeHistory.ts b/src/gas/fetchFeeHistory.ts
index 62cb4f1c19..15ee6303da 100644
--- a/src/gas/fetchFeeHistory.ts
+++ b/src/gas/fetchFeeHistory.ts
@@ -9,7 +9,6 @@ type HexString = `0x${string}`;
  *
  * Historical data for gas and priority fees for a range of blocks within a
  * particular network. This can be used to gauge how congested the network is.
- *
  * @property {string} startBlockId - The id of the oldest block in the block
  * range requested (as hex).
  * @property {Array<BlockFeeHistory>} blocks - Data for the blocks in the block
@@ -25,7 +24,6 @@ type FeeHistory = {
  * @type BlockFeeHistory
  *
  * Historical data for gas and priority fees for a block.
- *
  * @property {Array<number>} baseFeePerGas - The base fee per gas for the block.
  * @property {Array<number>} gasUsedRatio - A number between 0 and 1 that
  * represents the ratio between the effective gas used and the gas limit for
@@ -53,36 +51,36 @@ type EthFeeHistoryResponse = {
   };
 };
 
-function hexToDec(hex: string): any {
+/**
+ * Converts a hexadecimal string to a decimal number (as a BN instance).
+ *
+ * @param hex - A string encoding a hexadecimal number (with a "0x") prefix.
+ * @returns The BN instance.
+ */
+function hexToDec(hex: string): BN {
   return new BN(new BN(stripHexPrefix(hex), 16).toString(10), 10);
 }
 
 /**
- * Uses eth_feeHistory (an EIP-1559 feature) to obtain information about gas and
- * priority fees from a range of blocks that appeared on a network, starting
- * from a particular block and working backward in time. This can be used to
- * gauge how congested the network is.
+ * Uses eth_feeHistory (an EIP-1559 feature) to obtain information about gas and priority fees from
+ * a range of blocks that appeared on a network, starting from a particular block and working
+ * backward in time. This can be used to gauge how congested the network is.
  *
  * @param args - The arguments.
- * @param args.ethQuery - An EthQuery instance that wraps a provider for the
- * network in question.
- * @param args.endBlock - Which block to start with when forming the block
- * range. Can be a block tag ("latest" for the latest successful block or
- * "pending" for the latest pending block) or a block id.
- * @param args.numberOfBlocks - How many blocks to jump back from the endBlock when
- * forming the block range. Each array in the return value will be of this
- * length.
- * @param args.percentiles - A tuple of numbers between 1 and 100 which will
- * advise how priorityFeesByPercentile in the return value will be formed. When
- * Ethereum runs the eth_feeHistory method, for each block it is considering, it
- * will calculate the ratio of gas used for each transaction compared to the
- * total gas used for the block, then sort all transactions in the block by this
- * ratio. For each percentile given, it will then find the transaction whose gas
- * used ratio matches the percentile and capture that transaction's priority fee.
- * Hence, priorityFeesByPercentile represents the priority fees of transactions
- * at key gas used ratios.
- *
- * @return Promise<FeeHistory>
+ * @param args.ethQuery - An EthQuery instance that wraps a provider for the network in question.
+ * @param args.endBlock - Which block to start with when forming the block range. Can be a block tag
+ * ("latest" for the latest successful block or "pending" for the latest pending block) or a block
+ * id.
+ * @param args.numberOfBlocks - How many blocks to jump back from the endBlock when forming the
+ * block range. Each array in the return value will be of this length.
+ * @param args.percentiles - A tuple of numbers between 1 and 100 which will advise how
+ * priorityFeesByPercentile in the return value will be formed. When Ethereum runs the
+ * eth_feeHistory method, for each block it is considering, it will calculate the ratio of gas used
+ * for each transaction compared to the total gas used for the block, then sort all transactions in
+ * the block by this ratio. For each percentile given, it will then find the transaction whose gas
+ * used ratio matches the percentile and capture that transaction's priority fee. Hence,
+ * priorityFeesByPercentile represents the priority fees of transactions at key gas used ratios.
+ * @returns The fee history data.
  */
 export async function fetchFeeHistory({
   ethQuery,
diff --git a/src/util.ts b/src/util.ts
index 040daa8631..9631fe5826 100644
--- a/src/util.ts
+++ b/src/util.ts
@@ -768,6 +768,17 @@ export function validateMinimumIncrease(proposed: string, min: string) {
   throw new Error(errorMsg);
 }
 
+/**
+ * Rotates a matrix. That is, takes an array of tuples (arrays) representing rows and columns and
+ * reorients that array such that rows becomes columns and vice versa. Each row is expected to have
+ * the same number of columns, although if that is not the case, then the final result will have the
+ * same number of columns per row, where values may be filled in with undefined.
+ *
+ * @param args - The arguments.
+ * @param args.tuples - The tuples on which we want to operate.
+ * @param args.numberOfColumnsPerTuple - The number of columns you expected each row to have.
+ * @returns The rotated array of arrays.
+ */
 export function zipEqualSizedTuples({
   tuples,
   numberOfColumnsPerTuple,