node --version
 v10.15.3

` > [email protected] start /Users/qk/github/gis/green-gis-manager

ng serve

** Angular Live Development Server is listening on localhost:4200, open your browser on http://localhost:4200/ **
10% building modules 6/6 modules 0 activeℹ ｢wds｣: Project is running at http://localhost:4200/
ℹ ｢wds｣: webpack output is served from /
ℹ ｢wds｣: Content not from webpack is served from /Users/qk/github/gis/green-gis-manager
ℹ ｢wds｣: 404s will fallback to //index.html

Date: 2020-09-06T00:48:32.604Z
Hash: 56d8c1df1779ebbf9d10
Time: 6794ms
chunk {main} main.js, main.js.map (main) 357 kB [entry] [rendered]
chunk {polyfills} polyfills.js, polyfills.js.map (polyfills) 357 kB [entry] [rendered]
chunk {runtime} runtime.js, runtime.js.map (runtime) 5.22 kB [entry] [rendered]
chunk {scripts} scripts.js, scripts.js.map (scripts) 231 kB [rendered]
chunk {styles} styles.js, styles.js.map (styles) 1.11 MB [entry] [rendered]
chunk {vendor} vendor.js, vendor.js.map (vendor) 5.5 kB [initial] [rendered]

ERROR in node_modules/@types/leaflet/index.d.ts(810,24): error TS2503: Cannot find namespace 'L'.
node_modules/@types/leaflet/index.d.ts(812,33): error TS2503: Cannot find namespace 'L'.
node_modules/@types/leaflet/index.d.ts(813,34): error TS2503: Cannot find namespace 'L'.
node_modules/@types/leaflet/index.d.ts(1802,25): error TS2503: Cannot find namespace 'L'.`