Fix TypeScript errors in lib/utils

[rgieseke]

This fixes a few more TypeScript errors, those in lib/utils (see #218).

The error messages were:

src/lib/utils/makeAccessor.js:4:33
Error: Generic type 'Array<T>' requires 1 type argument(s). 
	Make an accessor from a string, number, function or an array of the combination of any
	@param {string|number|Function|Array} acc The accessor function, key or list of them.
	@returns {Function} An accessor function.
--
src/lib/utils/makeAccessor.js:8:23
Error: Type 'null' is not assignable to type 'Function'. 
export default function makeAccessor(acc) {
	if (!canBeZero(acc)) return null;
	if (Array.isArray(acc)) {
--
src/lib/utils/makeAccessor.js:10:10
Error: Parameter 'd' implicitly has an 'any' type. 
	if (Array.isArray(acc)) {
		return d =>
			acc.map(k => {
--
src/lib/utils/makeAccessor.js:15:10
Error: Parameter 'd' implicitly has an 'any' type. 
	} else if (typeof acc !== 'function') {
		return d => d[acc];
	}
--
src/lib/utils/filterObject.js:10:34
Error: Element implicitly has an 'any' type because expression of type 'string' can't be used to index type '{}'.
  No index signature with a parameter of type 'string' was found on type '{}'. 
		Object.entries(obj).filter(([key, value]) => {
			return value !== undefined && comparisonObj[key] === undefined;
--
src/lib/utils/debounce.js:8:6
Error: Variable 'timer' implicitly has type 'any' in some locations where its type cannot be determined. 
export default function debounce(func, timeout = 300) {
	let timer;
	return (...args) => {
--
src/lib/utils/debounce.js:9:10
Error: Rest parameter 'args' implicitly has an 'any[]' type. 
	let timer;
	return (...args) => {
		clearTimeout(timer);
--
src/lib/utils/debounce.js:10:16
Error: Variable 'timer' implicitly has an 'any' type. 
	return (...args) => {
		clearTimeout(timer);
		timer = setTimeout(() => {
--
src/lib/utils/debounce.js:12:15
Error: 'this' implicitly has type 'any' because it does not have a type annotation. 
		timer = setTimeout(() => {
			func.apply(this, args);
		}, timeout);
--
src/lib/utils/arraysEqual.js:6:10
Error: Generic type 'Array<T>' requires 1 type argument(s). 
	of making a set
	@param {Array} arr1 An array to test
	@param {Array} arr2 An array to test against
--
src/lib/utils/arraysEqual.js:7:10
Error: Generic type 'Array<T>' requires 1 type argument(s). 
	@param {Array} arr1 An array to test
	@param {Array} arr2 An array to test against
	@returns {boolean} Whether they contain all and only the same items
--
src/lib/utils/padScale.js:19:34
Error: Parameter 'scale' implicitly has an 'any' type. 

export default function padScale(scale, padding) {
	if (typeof scale.range !== 'function') {
--
src/lib/utils/padScale.js:19:41
Error: Parameter 'padding' implicitly has an 'any' type. 

export default function padScale(scale, padding) {
	if (typeof scale.range !== 'function') {
--
src/lib/utils/padScale.js:41:38
Error: Parameter 'd' implicitly has an 'any' type. 

	const [d1, d2] = scale.domain().map(d => {
		return isTime ? lift(d.getTime()) : lift(d);

[rgieseke]

Here I went through the d3-docs and added the interface definitions.

Not sure whether one should exclude those that are filtered out with unpaddable or whether there is already combinations like scaleContinuousNumeric which would make the list shorter.

[rgieseke]

Changing this to an arrow function was the solution I found to this not being defined.

[mhkeller]

Thanks for this one. I was away for a few weeks and will go through this.