generate filter context dax query

dax.m

FILTERCONTEXT =
VAR OutDateYear = CALCULATE ( IF ( ISCROSSFILTERED ( '[Dim] Date Calendar'[Date].[Year] ), CONCATENATEX(VALUES('[Dim] Date Calendar'[Date].[Year] ), '[Dim] Date Calendar'[Date].[Year] , "',' "), "ALL MEMBERS" ), ALLSELECTED ( '[Dim] Date Calendar' ) )
VAR OutDateMonth = CALCULATE ( IF ( ISCROSSFILTERED ( '[Dim] Date Calendar'[Date-Month] ), CONCATENATEX(VALUES('[Dim] Date Calendar'[Date-Month] ), '[Dim] Date Calendar'[Date-Month] , "',' "), "ALL MEMBERS" ), ALLSELECTED ( '[Dim] Date Calendar' ) )
RETURN
"{'[Dim] Date Calendar.[Date].[Year]' : ['" & OutDateYear&"'], '[Dim] Date Calendar.Date-Month' : ['" & OutDateMonth&"']}"

gendax.js

function generateDAXQuery(selectedFilters) {
  try {
    const queryParts = [];
    const regexPattern = /[\s.[\]]/g;
    const regexOutPattern = /[\s.\-[\]]/g;
    let openBrkt = "[";
    let closeBrkt = "]";

    for (const [filterName, tableVal] of Object.entries(selectedFilters)) {
      if (filterName.indexOf("]") !== -1) {
        openBrkt = "";
        closeBrkt = "";
      }else{
        openBrkt = "[";
        closeBrkt = "]";
      }
      const tableName = "'" + tableVal + "'";
      const filterExpression = `CONCATENATEX(VALUES(${tableName}${openBrkt}${filterName}${closeBrkt} ), ${tableName}${openBrkt}${filterName}${closeBrkt} , "',' ")`;
      const outVariableName = `Out${filterName.replace(regexOutPattern, "")}`;
      const outExpression = `CALCULATE ( IF ( ISCROSSFILTERED ( ${tableName}${openBrkt}${filterName}${closeBrkt} ), ${filterExpression}, "ALL MEMBERS" ), ALLSELECTED ( ${tableName} ) )`;

      queryParts.push(`VAR ${outVariableName} = ${outExpression}`);
    }
    const returnExpression =
      `RETURN
"{${Object.entries(selectedFilters)
        .map(([filterName, tableVal]) => {
          const filterNameWithoutSpace = filterName.replace(regexOutPattern, "");
          return `'${tableVal + "." + filterName}' : ['" & ${
            "Out" + filterNameWithoutSpace
          }`;
        })
        .join(`&"'], `)}` + `&"']`;

    return (
      "FILTERCONTEXT =" +
      "\n" +
      queryParts.join("\n") +
      "\n" +
      returnExpression +
      '}"'
    );
  } catch (err) {
    return "";
  }
}

const selectedFilters = {
  "[Date].[Year]": ["[Dim] Date Calendar"],
  "Date-Month": ["[Dim] Date Calendar"],
};

generateDAXQuery(selectedFilters);

output.json

{'[Dim] Date Calendar.[Date].[Year]' : ['2019',' 2020'], '[Dim] Date Calendar.[Date-Month]' : ['ALL MEMBERS']}