Ag Grid shared functions possible?

I have several grids that utilize functions to format data (mostly ValueFormatter functions). I would like to put them into one shared TS file to be imported and used by multiple components. However, when I do this, I get an error about Promise

(Error Build:'Promise' only refers to a type, but is being used as a value here. Do you need to
change your target library? Try changing the 'lib' compiler option to es2015 or later.)


simply by importing formatDate from angular/common. My lib compiler option is es2018... so that's not it.

"lib": [
"es2018",
"dom"
],


Has anyone done something similar? For example, a function I would like to use on multiple grids/components:

dateFormatter(params: ValueFormatterParams) {
var myDate: string = '';
if (params.value) {
myDate = formatDate(new Date(params.value), 'MM/dd/yyyy', 'en-US');
}
return myDate;
}


Would think I could just create a grid-shared.ts file importing the things needed and then export the functions but I get build errors shown above.

Here is the grid-shared.ts file I am trying to build for re-use of code.

import { formatDate } from "@angular/common";
import { IDateFilterParams, ValueFormatterParams } from "ag-grid-community";

export function caseFormatter(params: ValueFormatterParams) {
if (params.value) {
// pad number to be 7 characters in length
var formattedValue: string = params.value.toString().padStart(7, "0");
return formattedValue.slice(0, 6) + '-' + formattedValue.slice(6);
}
else { return ''; }
}
export function dateFormatter(params: ValueFormatterParams) {
var myDate: string = '';
if (params.value) {
myDate = formatDate(new Date(params.value), 'MM/dd/yyyy', 'en-US');
}
return myDate;
}

export const dateTimeFilterParams: IDateFilterParams = {
comparator: (filterLocalDateAtMidnight: Date, cellValue: string) => {
const dateAsString = cellValue;
if (dateAsString == null) return -1;
const dateTimeStrings = dateAsString.split("T");
const dateParts = dateTimeStrings[0].split("-");
const cellDate = new Date(
Number(dateParts[0]),
Number(dateParts[1]) - 1,
Number(dateParts[2]),
);
if (filterLocalDateAtMidnight.getTime() === cellDate.getTime()) {
return 0;
}
if (cellDate < filterLocalDateAtMidnight) {
return -1;
}
if (cellDate > filterLocalDateAtMidnight) {
return 1;
}
return 0;
},
};

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